Just wondering if anyone knows what OS is running inside these magical little boxes?
Something of A&H design which is custom made, 100% proprietary, and closed sourced.
At least some element inside runs Linux.
Although interestingly there is not an entry on the A&H FOSS declaration page for the CQ itself, just the mobile apps.
I am trying to think through the whole multitrack sd card issue Iāve been reading about. I would love to capture at 96K all 16 channels on the CQ20B. Shows are typically two to three hours straight through so not changing out cards would be awesome. Being the drummer/technical director for the group is a bit much at times.
Coming from the Soundcraft UI24R to this unit has been a game changer this far. I bought one unit, used it for one small venue show and ordered a second one for our large venue rig the following Monday. Great stuff in such a small form factor.
its deffo got linux on it.
Thanks for all the feedback folks. I found a calculator on line that helped to find the capacity I need to run. Now, time to see if the CQ will recognize all of the SD Card space. I will circle back after my recon is complete.
Quick Update:
I used a 120gb SDXC card in the mixer over the weekend. I formatted with the mixer and was able to see 119 gb of storage on the mixer. I have not used the record function live with this card in the unit yet. It was promising to see all of the storage space available on the unit though. This tells me that the OS inside the box does not use the typical Windows FAT32 32gb partition limitations. I will circle back after sampling a live show at 96k with my results! Have a great week.
Update! The card worked flawlessly. 3 hour set used 42gb at 96k.
@WildR, can you share the brand of card you are using?
Thanks!
Sandisk Brand with the fastest write speed you can find. I think I am running a 300 meg write speed. I can double check that once I am close to my mixer.
A&H canāt get around the 4GB file size limit of FAT32. However, since the multitrack recorder produces single mono files, one recording can be quite long. I must admit, I never tried to go beyond something like 3 hours in my CQ and SQ (which seem to share the same recorder implementation). If i pocket-calculated correctly, 4GB of 24/96 mono should be around 4.14 hours. This should also be what the recorder says is the available recording time, even when using very large storage (I have one setup with a 2TB SSD on the SQ). When set to 48khz, the limit is 8.something hours, which makes sense, since it is only half the number of samples per second.
Concerning the SD card, I use Sandisk Extreme Pro cards. This actually came from my other job, doing video, where I needed cards that could swallow a lot of data on the spot. I found those SD cards to be reliable in my cameras, and I simply put one of those in my CQ. That CQ doesnāt even need that speed from the card. But that speed is also more convenient when transferring the recording to your computer.
When arming the recording, it takes quite a while with larger storage, so a smaller card (128GB or less) might be a better choice. Also theyāre cheaper.
According to this thread the A&H SD card recommendations are not necessarily fixed limitations. I would greatly appreciate an official A&H statement of clarity from Keith pursuant to our SD card possible size & speed options and the risk factors involved with deploying bigger, faster cards: if he is at liberty to do so.
Hugh
I found a calculator on line that helped to find the capacity I need to run. <
That is the simplest arithmetic.
You can do it with every calculator available, including the one between your ears.
So is it Linux based or is it something else? Nobody has cited any kind of source to support a claim either way.
Why is it important to you?
Honestly I have never looked into it myself. My initial comment was probably a little too strongā¦.. My intent was to convey the fact that all of the āA&Hā portions of the system are surely locked down to prevent intellectual property theft. It very well may run on a Linux base however. Again, I have never looked into it.
Long story short, please donāt base your assumptions on my commentsā¦ā¦
Itās always said that A&H read everything here, but they like tend to steer clear of questions that only they could answer.
Perhaps itās more entertaining for them to just read along here. 
Keith once commented on this with the SQ, but based on many similarities, the lack of MP3 playback and the lack of a system clock (not audio clock), Iām simply assuming that also CQ and QU 2.0 donāt use any known operating systems.
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Read and believe this if you dare.
It is a Google AI response, so who knows of its accuracyā¦.
Sounds like they do utilise Linux OS as a basis for their own specific version to some extent anyway.
You canāt always trust the results AI gives. Use the Google AI studio and turn on grounding.
The real question here ā does this mean the CQ defective USB driver which causes one of the stereo inputs we paid for the be unusable may never be fixed?
Might want to re-read my comment.
I already stated that it was AI and canāt necessarily be trusted. 