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Re: Pocket 4K - weak preamps?

PostPosted: Tue Nov 27, 2018 7:53 pm
by Rakesh Malik
Australian Image wrote:Then why does my Olympus E-M1 MkII provide me with the option of turning on power to the 3.5mm mic input? If it's off, the mic doesn't work, if on, it does.


It's plug-in power, not phantom power -- different spec, and appropriate that it's available on a consumer camera, but not on a professional one.

Re: Pocket 4K - weak preamps?

PostPosted: Tue Nov 27, 2018 8:03 pm
by John Paines
rick.lang wrote:No wonder BMD has commented on better control of noise... they just forgot to mention they crushed the levels to do it. (I may be guilty of overstating it.)


Unless the camera mics are extraordinarily hot, it's hard to draw that conclusion. The onboard sound is good (for a camera, anyway), and the levels are in the range of normal.

I think the 3.5mm issue is a manufacturing defect, but I guess we'll find out. BTW, it's only fair to note that Robert N. came up with pretty much the same measurement for mic level a few weeks ago.

Re: Pocket 4K - weak preamps?

PostPosted: Tue Nov 27, 2018 10:52 pm
by John Morris
John Paines wrote: Just to clarify, was it your finding that 3.5mm line level stereo is also 12db less sensitive than line level on the BMPCC?

Yes, thats right, at least on my copy. I also thought initially the difference was greater, but that turned out to be inaccurate meters on the old BMPCC.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 4:52 am
by Wayne Steven
Its probably hard to tell from just a 1khz tone. The response curve and quality can vary on frequency and power. So it's probably worth testing at many frequency points varying power points and a general sweep to pick up any distortion missed, if you think something is a bit off. Is rightmark audio analyzer suitable for this, or has things moved on from those days?

The higher sensitivity in mono is probably because the sample is going to one ADC, but you wouldn't think it as its only taking one microphone (I hope). Maybe there is some non linear response there?

But, isn't it normal professionally to record lower db to handle highs for a wider dynamic range, as more sensitive equipment will pickup the lower end of the range?

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 7:01 am
by rick.lang
Thanks John Paines for the reminder re Robert’s post.


Sent from my iPhone using Tapatalk

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 1:41 pm
by Richard Knight
Most tv broadcast dialogue in the UK is recorded at about -20 to -12, perhaps the mic amps are optimised for this level?

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 2:57 pm
by Leon Benzakein
Ray, may I put forward the idea that you are experiencing a problem on your particular camera re the Rode VideoMicro and plug-in power.

I have the original BMPCC and my Rode VideoMicro works as it should, although at low level.
I do not see why BMD would not include this function on the new BMPCC4K.
Others have stated that plug-in power works on their BMPCC4k.

It could just be your camera.

I have a Beachtek mini mixer specificly made for the BMPCC that does not provide plug-in power, so I understand your frustration.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 3:29 pm
by Leon Benzakein
Denny Smith wrote:John Paines, I will not bother you anymore with my thoughts or ideas. It is comments like yours that have forced the most of the original contributors off this forum. Good bye.


Denny, I for one appreciate your thoughts and ideas. Please keep them coming.
No one is perfect and you have proved that you are the first one to admit this.
What I appreciate most about your posts are the spelling mistakes.
This flaw gives me a feeling of superiority because I am aware of how smart you really are but how really dumb your iPad is and yet you won't fire the thing.
At least my keyboard is smarter than yours.

I do not understand why people have to be unpleasant.

Plug-in power to the people!

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 3:56 pm
by joe12south
There are two camps on xlr performance (some reports of fine and dandy, others complaining of the same issue as with 3.5mm), so it will be interesting to see what your findings are, at least for your own unit.

I'm interested, as well, but there is no doubt that the P4K's XLR inputs are weak. Compared to every other device I own, the signal is demonstrably lower - unusable with anything but a "hot" mic.

Just as an example, with the P4K's gain maxed, it records a lower signal level than the GH5 at minimum.

While it's possible this is just my camera, how likely is that, really?

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 5:04 pm
by Johan Cramer
To be clear, the Pocket 4K does have plug-in power on its 3.5mm jack, otherwise mics such as the Ohrwurm binaural mic or the Rode VideoMicro wouldn't work at all.

With Ohrwurm's creator, Wolfgang Winne of digitalfx, I tested whether the plug-in power of the camera might be too weak. Wolfgang provided me with an independent, 9V block battery-powered plugin-power source that could be put in between the camera and the mic. Unfortunately, it didn't change audio levels on the camera at all.

His conclusion (translated from German): "the camera's audio-in must have very low impedance..... that's likely the problem, the camera input strains the microphone too much (almost to the point of short circuiting)."

Unlike Wolfgang, I'm not an engineer, so maybe others can think up solutions.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 7:16 pm
by Denny Smith
Ray, I think you should contact your local,BM Support Office and RMA that Camera! Obviously something is wrong there, you need to have the camera tested.
Cheers

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 7:18 pm
by Denny Smith
Leon, thanks. I did fire my old Mini IPad, sent it to my daughter. I do have a Apple Bluetooth keyboard for my IPadPro, which I have not been using, so I guess it is time to break it out... :roll:
Cheers

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 7:39 pm
by b_flow
has anyone actually RMA'd this camera for the audio issues? Has anyone gotten it fixed?

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 9:00 pm
by Leon Benzakein
Johan Cramer wrote:Wolfgang provided me with an independent, 9V block battery-powered plugin-power source that could be put in between the camera and the mic.


Can you provide info on this 9V block battery-powered plugin-power source that can be put in between the camera and the mic.

I have been using a Zoom H1 as power source for the Rode VideoMicro when using the Beachtek device that does not supply plug-in power even though it has a 9 volt battery. What were they thinking?

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 9:14 pm
by John Paines
[information pending, ignore.]

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 9:26 pm
by Johan Cramer
Leon Benzakein wrote:Can you provide info on this 9V block battery-powered plugin-power source that can be put in between the camera and the mic.

Wolfgang soldered/glued it as a quick-and-dirty, one-off test protoype and mailed it to me. It's the contraption on the left half of the image:

Image

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 10:45 pm
by Leon Benzakein
Johan Cramer wrote:
Leon Benzakein wrote:Can you provide info on this 9V block battery-powered plugin-power source that can be put in between the camera and the mic.

Wolfgang soldered/glued it as a quick-and-dirty, one-off test protoype and mailed it to me. It's the contraption on the left half of the image:

Image


Thanks for the response but I was not able to access the image.
Cheers

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 11:03 pm
by Leon Benzakein
I wonder if this would work.

3.5mm MONO JACK PLUG IN POWER SUPPLY BATTERY MODULE FOR ELECTRET LAPEL LAVALIERE

https://www.ebay.com/itm/3-5mm-MONO-JAC ... .l4275.c10

US $17.55

power supply for lavalier mic.jpg
power supply for lavalier mic.jpg (118.57 KiB) Viewed 16967 times

Re: Pocket 4K - weak preamps?

PostPosted: Wed Nov 28, 2018 11:18 pm
by Leon Benzakein
I found this by Aputure and wondered if the inline PSU would power the VideoMicro.

US$30.00-$35.00

https://www.aputure.com/products/a-lav-1

Aputure lavaliere mic.jpg
Aputure lavaliere mic.jpg (49.21 KiB) Viewed 16962 times


Only downside is rechargeable battery.

Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 9:14 am
by RobStowell
Again - there is definitely power through the 3.5mm jack unless the camera has a fault. But the level you can get is so low there might as well not be :( At least it will run radio mics.
Just got the mini xlr adapters. Hope that isn't also very low. I'd like to use the cam for interviews without an extra preamp to worry about.

Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 2:28 pm
by Wayne Steven
Richard Knight wrote:Most tv broadcast dialogue in the UK is recorded at about -20 to -12, perhaps the mic amps are optimised for this level?


My point.

Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 2:31 pm
by Wayne Steven
Johan Cramer wrote:To be clear, the Pocket 4K does have plug-in power on its 3.5mm jack, otherwise mics such as the Ohrwurm binaural mic or the Rode VideoMicro wouldn't work at all.

With Ohrwurm's creator, Wolfgang Winne of digitalfx, I tested whether the plug-in power of the camera might be too weak. Wolfgang provided me with an independent, 9V block battery-powered plugin-power source that could be put in between the camera and the mic. Unfortunately, it didn't change audio levels on the camera at all.

His conclusion (translated from German): "the camera's audio-in must have very low impedance..... that's likely the problem, the camera input strains the microphone too much (almost to the point of short circuiting)."

Unlike Wolfgang, I'm not an engineer, so maybe others can think up solutions.



I remember Wolfgang, how's he doing? He's a thorough fellow. What was his website again?

Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 2:52 pm
by Johan Cramer
Wayne Steven wrote:I remember Wolfgang, how's he doing? He's a thorough fellow. What was his website again?

http://www.ohrwurmaudio.eu

Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 4:09 pm
by Leon Benzakein
Australian Image wrote:
I'm fairly certain that would work and I considerer it, but was put off by the very long cable.

But what you need to consider is that they don't amplify the sound.


This may be what you are looking for:

Saramonic SmartRig+ 2-Channel XLR Microphone Audio Mixer

https://www.bhphotovideo.com/c/product/ ... tml?sts=pi

https://www.amazon.com/s/ref=nb_sb_noss ... c+SmartRig


Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 4:24 pm
by John Paines
b_flow wrote:has anyone actually RMA'd this camera for the audio issues? Has anyone gotten it fixed?


BMD support is aware of the issue and it may be worth filing a report, so the scope of the condition becomes clearer to them, but I wouldn't send in a camera at present, as it's unlikely that whatever comes back will be better, pending further developments....

I think it's fair to say the camera was not designed this way to serve the British TV market.

Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 6:57 pm
by rick.lang
Leon, that Saramonic SmartRig+ is impressive for the price. May not include any limiter though.


Sent from my iPhone using Tapatalk

Re: Pocket 4K - weak preamps?

PostPosted: Thu Nov 29, 2018 11:36 pm
by Leon Benzakein
rick.lang wrote:Leon, that Saramonic SmartRig+ is impressive for the price. May not include any limiter though.


Sent from my iPhone using Tapatalk


"Word!"

Re: Pocket 4K - weak preamps?

PostPosted: Fri Nov 30, 2018 12:37 am
by Leon Benzakein
Australian Image wrote:My audio is now excellent, through just a Rode VideoMicro. Some morning tests today picked up even faint bird songs in the distance.


What did you do different?

Re: Pocket 4K - weak preamps?

PostPosted: Fri Nov 30, 2018 12:46 am
by Wayne Steven
John Paines wrote: I think it's fair to say the camera was not designed this way to serve the British TV market.


I'm curious about the design reason behind the low recordings in the UK. I know it is used professionally, not just there, and a bane on end consumer releases where you just can't get the volume on smaller systems.

Is it just to squash the lower end to make more room for the higher end? I notice (just from memory nor observation) British TV productions seem to be more squashed and clean in the lower end. Of course that's not want you want out in the field live in documentaries, where you strain to dictate levels.

Here's a Bluetooth suggestion, a wheel control that let's you ride the audio live. You could pin it to a cage, or stick it on the side of the camera.

Re: Pocket 4K - weak preamps?

PostPosted: Fri Nov 30, 2018 12:48 am
by Wayne Steven
He put this powered section inbetween the mic and an amp:

Australian Image wrote:I've ordered one of these: https://audio-technica.com.au/products/at9903/ so I can to put the power module between my Rode VideoMicro and Cayin amplifier to provide power to the Rode. This, I hope, will enable me to get rid of the LS-14 audio recorder.

Re: Pocket 4K - weak preamps?

PostPosted: Fri Nov 30, 2018 3:00 am
by rick.lang
I think we’re just holding our breath to hear from BMD on this. If there’s nothing planned from BMD, you’ll certainly generate interest. Good news you have a solution today.


Sent from my iPhone using Tapatalk

Re: Pocket 4K - weak preamps?

PostPosted: Sat Dec 01, 2018 10:33 pm
by Leon Benzakein
Australian Image wrote:
Leon Benzakein wrote:
Australian Image wrote:My audio is now excellent, through just a Rode VideoMicro. Some morning tests today picked up even faint bird songs in the distance.


What did you do different?


I detailed this in a previous post, but received no interest.


Huh :?: :?: :?: :?: :?:

I thought that asking questions was showing interest.

Re: Pocket 4K - weak preamps?

PostPosted: Sun Dec 02, 2018 9:44 am
by Wayne Steven
I quoted it before for you Leon.

Re: Pocket 4K - weak preamps?

PostPosted: Sun Dec 02, 2018 4:03 pm
by Leon Benzakein
Wayne Steven wrote:I quoted it before for you Leon.


Thanks Wayne. I appreciate that.

I must have been on Mars with my buddy Matt Damon when Ray informed us that he had received the part he was waiting for.

My bad.

Are all Australians bad tempered or just the ones that purchase BMD products?

Re: Pocket 4K - weak preamps?

PostPosted: Sun Dec 02, 2018 6:47 pm
by Denny Smith
[quote="Leon Benzakein”

Are all Australians bad tempered or just the ones that purchase BMD products?[/quote]

That is a good one Leon :lol:
Cheers

Re: Pocket 4K - weak preamps?

PostPosted: Mon Dec 03, 2018 9:20 am
by Wayne Steven
Leon Benzakein wrote:
Wayne Steven wrote:I quoted it before for you Leon.


Thanks Wayne. I appreciate that.

I must have been on Mars with my buddy Matt Damon when Ray informed us that he had received the part he was waiting for.

My bad.

Are all Australians bad tempered or just the ones that purchase BMD products?


Don't know, but find a lot of bad tempered non Australians on cinema forums.

I tend to find low end people a bit moodier around here and higher end people more wonderful on forums, but then again, non left wing Australians tend to not suffer foolishness gladly (except themselves). So, repeatedly asking about something posted and pointed out might fall in that category with them It doesn't really affect me that much, just a misunderstanding unless it refuses to resolve. Certain Europeans are the worst as far as attitude, worse then certain Americans. Australians tend to let things fly more than I do (because I SEE), but rough necks are rough necks, which gets me into Australian builders.

But still, I did require a logical leap to ascertain the reason why the video mic started working by itself, was because he inserted the part he had received previously to do it, between the camera and it. Still, good news. But BM should publish a microphone sticky with which mokrs work with it.


Hmm, just a thought I want to do my own processor array, and BM does enough products to run an volume asic wafer program with a mixture of parts on the wafer, allowing them to custom asic all their cameras reducing cost, size and heat. I could hitch a ride. They can do this where it is maybe more expensive for Red (though they may have arrangements with their sensor provider) because BM produces a range of products making their volumes much higher). Maybe I should talk with them in the future my designs would outdo most anything they are using. Got to dig up that asic chip making software out they used for industry leading low energy solutions.

Re: Pocket 4K - weak preamps?

PostPosted: Tue Dec 04, 2018 6:52 pm
by Benjamin de Menil
I just tried out the stereo videomic X with the pocket 4K's 3.5mm jack. With the mic seto to +20db mode, levels barely showed when I clapped right in front of the mic.

Also, the pocket 4k's mic gain is grayed out when I have inputs set to 3.5mm. Is this normal?

Re: Pocket 4K - weak preamps?

PostPosted: Tue Dec 04, 2018 7:30 pm
by Benjamin de Menil
Benjamin de Menil wrote:I just tried out the stereo videomic X with the pocket 4K's 3.5mm jack. With the mic seto to +20db mode, levels barely showed when I clapped right in front of the mic.

Also, the pocket 4k's mic gain is grayed out when I have inputs set to 3.5mm. Is this normal?


I just got of the phone with BM support and discovered something that may be helpful to people using 3.5mm inputs:
The 3.5mm inputs can be set to line level or mic level. But the mic level option is not available in the menu if one of the channels is set to 3.5mm line. So before setting the first side to 3.5mm mic, make sure the other side isn't set to one of the 3.5mm line options. The reverse is true for discovering line level options if you have a side set to mic level.

With 3.5mm inputs set to mic level I got plenty of gain with rode videomic X. I'm not experiencing the level issues others on this forum have reported. Maybe my unit is from a later batch. But I haven't had a chance to check the quality of the audio - I'm just going by what I see on the levels, which is plenty of gain to spare.

Re: Pocket 4K - weak preamps?

PostPosted: Tue Dec 04, 2018 9:51 pm
by John Paines
Benjamin de Menil wrote:
Benjamin de Menil wrote:I just tried out the stereo videomic X with the pocket 4K's 3.5mm jack. With the mic seto to +20db mode ... I'm not experiencing the level issues others on this forum have reported.


From your description, you're experiencing exactly the same levels reported here. The difference is, the mic's amplifier is adding 20db to the signal. Set it to zero added gain, and see what happens.

Re: Pocket 4K - weak preamps?

PostPosted: Tue Dec 04, 2018 11:32 pm
by Benjamin de Menil
John Paines wrote:
Benjamin de Menil wrote:
Benjamin de Menil wrote:I just tried out the stereo videomic X with the pocket 4K's 3.5mm jack. With the mic seto to +20db mode ... I'm not experiencing the level issues others on this forum have reported.


From your description, you're experiencing exactly the same levels reported here. The difference is, the mic's amplifier is adding 20db to the signal. Set it to zero added gain, and see what happens.


I just had to lower it to zero because I had too much gain, even with the pocket's gain at 50%. It looked like with gain set to 50% I was clipping the Pocket 4K's pres or AD at about -6dB. That would mean that at 50% gain it's not possible to get to 0dB. Could also be the Rode mic was saturating. Anyway, was fine once I set the mic to flat gain. I was recording a concert, drums and amplified instruments. I'll see how it fairs tomorrow with conversational level volumes.

Generally speaking, I'd always get as much gain out of the mic as possible, because I figure the mic's gain is better than the camera's. With Rode video mics, it doesn't seem to me that my version of the Pocket has a problem.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 12:05 am
by Joe Giambrone
This is new, and potentially important:

Does it mean the issue is solved, and it was just a matter of the correct setting?


I just got of the phone with BM support and discovered something that may be helpful to people using 3.5mm inputs:

The 3.5mm inputs can be set to line level or mic level. But the mic level option is not available in the menu if one of the channels is set to 3.5mm line. So before setting the first side to 3.5mm mic, make sure the other side isn't set to one of the 3.5mm line options. The reverse is true for discovering line level options if you have a side set to mic level.

With 3.5mm inputs set to mic level I got plenty of gain with rode videomic X. I'm not experiencing the level issues others on this forum have reported. Maybe my unit is from a later batch. But I haven't had a chance to check the quality of the audio - I'm just going by what I see on the levels, which is plenty of gain to spare.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 12:23 am
by John Paines
Joe Giambrone wrote:This is new, and potentially important:

Does it mean the issue is solved, and it was just a matter of the correct setting?


No. He had some user error to contend with. It sounds like his mic is "hot" to begin with (and may have additional amplification even at zero), and he was recording loud electric instruments and drums. Too many unknowns here to conclude much of anything.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 2:39 am
by Gene Kochanowsky
Benjamin de Menil wrote:The 3.5mm inputs can be set to line level or mic level. But the mic level option is not available in the menu if one of the channels is set to 3.5mm line. So before setting the first side to 3.5mm mic, make sure the other side isn't set to one of the 3.5mm line options. The reverse is true for discovering line level options if you have a side set to mic level.


That's weird and unexpected. I hope BM considers this a bug. I would expect 3.5mm Line and Mic should be selectable no matter what the other channel is set to.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 2:42 am
by John Paines
Gene Kochanowsky wrote:That's weird and unexpected. I hope BM considers this a bug. I would expect 3.5mm Line and Mic should be selectable no matter what the other channel is set to.


There's only one 3.5mm jack (with right/left channels), so how could you have line and mic levels at the same time? It's one or the other, for both channels.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 2:52 am
by Gene Kochanowsky
John Paines wrote:
Gene Kochanowsky wrote:That's weird and unexpected. I hope BM considers this a bug. I would expect 3.5mm Line and Mic should be selectable no matter what the other channel is set to.


There's only one 3.5mm jack (with right/left channels), so how could you have line and mic levels at the same time? It's one or the other, for both channels.


I agree, however on my camera I do not see selections for both 3.5mm line and mic unless the other channel is set to an input other than 3.5mm. Looks like a bug. Otherwise if both channels are set to 3.5mm line then mic is not selectable on either channel and visa versa.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 2:53 am
by Denny Smith
The Ursa Mini Pro OS, which the Pocket 4K is using, has two audio channels that are independent of each other and each channel can be individually selected (think stereo left/right) between the two audio input sources, XLR and XLR AES. Where the Original Pocket and Micro only has one audio source connection the 3.5 stereo inlut, so both channels were selected together from mic to line.

My guess, looking at the manual, the new Pocket 4K has a XLR inlut and two channel 3.5mm input. So the OS is Since the two are locked to gather on the 3.5 connection, both sides/channels need to be switched from mic to line, so you need to switch channel 1 and channel 2.

In theory, you could select one channel from the 3.5 and the other channel from the XLR. This would make sense, if using a lav wireless set to mono for one channel on the 3.5 Mic inlut and the other channel set to XLR Mic. for a shotgun or hand held mic. like in an interview situation.
Cheers

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 3:52 am
by Gene Kochanowsky
When this issue is described in text there seems to be some problems in understanding the issue, so for that instance I've made this little video.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 6:45 am
by Denny Smith
A Pix is word, and Yes, I see now what yiu are talking about, thanks for the video. This is not how the UM Pro/Broadcast audio menu works. Each audio channel is independent of the other, and one side can be mic, while the other side is line or AES.
So this indeed does seem to be either a design error or a bug in the OS.
Cheers

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 8:19 am
by Kristian Lam
Unlike URSA Mini Pro, the stereo 3.5mm inputs can either only be line or mic, hence when mic level is selected for one side, the other has to be the same which is why line is not available.

I can see why this could be confusing and the interface wi be tweaked to better communicate that the other option is not available.

Re: Pocket 4K - weak preamps?

PostPosted: Wed Dec 05, 2018 9:10 am
by Wayne Steven
Thanks Kristan. I think people probably would like a 3 to 5 line 3.5mm jack in the future, where each line could he independently set to anything, if BM is listening? Can hook up some surround that way. BTW, when's the next camera announcement? (Have to try, CES, new micro?). :)