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Cubasis 3.4 meltdown on iPad 9
**Without Bluetooth headphones: **
I recorded 9 guitar track using THU. All played back fine. I then recorded the input of Lumbeats Rock Drummer. Then things got weird.
With Bluetooth headphones:
I wasn't happy with the drums so I tried some things and went back to Lumbeats. Only this time there is no input. I tried many times and even restarted the iPad. Eventually I gave up and deleted everything except the guitar tracks. Then I hit play. 
It must be a buffer issue of some sort. I can't change the latency. It is locked on 4ms.
There is a happy ending though. Although I've deleted everything except the guitar tracks, playback is working again and the latency is at 11.6ms. I was mixing on Bluetooth headphones this whole time and the only way to get a stereo signal is to enable Bluetooth Airplay.
So, is there an issue here or is it just impossible to do anything at all with Bluetooth headphones. I know recording is not an option but I thought I could at least playback, mix, record an IAA. Yes, no?
Comments
I’m staying away from Bluetooth headphones when doing serious recording.
Fair enough, but I'm not recording.
Maybe not 100% sure - but I’d blame the IAA app - it’s notoriously flakey!!
IF I really want to use an IAA app I’ll try to stick to loading it, recording any audio using the IAA, then remove the IAA app and close it - because over the past 10+ years using IAA apps I’ve had them cause numerous issues.
...not this particular Lumbeat app you’re using - almost any IAA app.
I find I do exactly that with Lumbeat apps. Open it freestanding. Then load as IAA in Cubasis and remove it from the track after recording audio.
oft-repeated advice re Cubasis and bluetooth here:
https://forum.audiob.us/discussion/comment/846361/#Comment_846361
https://forum.audiob.us/discussion/comment/1005766/#Comment_1005766
Well in this case there may be multiple issues. Firstly the IAA no sound issue. Then the mess that followed. Last time, and others, that I used it, I opened Cubasis, opened the drum app, routed the IAA as input, recorded, removed the IAA and closed the drum app. Seemed to be no problem. Now with Bluetooth headphones it didn't make a sound no matter which sequence of loading events I trialed.
I don't know if other methods work. I tried adding the IAA before starting the app with this issue, among other things. Nothing worked. Seems like the difference was Bluetooth itself or activating Bluetooth Airplay in Cubasis settings.
Some interesting stuff there but nothing I'm not doing except for this below, which seems like a bug to be fixed more than a solid procedure for listening to Cubasis via bluetooth.
Just finished recording Lumbeats via IAA. Worked well without Bluetooth headphones. Looks to me like Cubasis can't cope with Bluetooth at all.