Qu-Drive is 18-tracks with
one patchable stereo pair for track 17-18. USB B is 24
channel with three patchable stereo pairs including the
same track 17-18 as Qu-Drive and the LR post-fade
mix on track 23-24.
But you can choose in the options which stereo channels you would like to record! Either ST1, 2 or 3! However, all of the Stereo Channels can only be recorded by using the USB-B Streaming!
The channel count on Qu-Drive is not likely to change I’m afraid. JoeCo’s recorder uses different (more expensive) technology, you can appreciate we cannot put £2k worth of recording technology in a <£2k mixer.
However we made the USB outputs fully patchable in Qu-24 and the plan is for the same to happen in Qu-16 v1.3 - to be released soon. This will allow simultaneous recording of a selection of mono / stereo inputs and mixes.
Beyond 18 tracks you can use the full-duplex USB B port which gives you a 24x22 interface (32x30 on Qu-24).