Not technically about the TP-7, but figured it would fit with the general Teenage Engineering theme of this thread.
So I have this thread to thank for the missing $2000 in my bank account. Picked up the T.E. TX-6 (not the TP7) as the six stereo channels mini-mixer. It's able to plug into a phone, and then can record multitrack to the phone.
Got the mixer in on Friday. Tried hard to get it to work with two different Android phone, but could only get partial functionality. Ugh. Plugged it into my ipad, and had it working within a few minutes. Plugged into my girlfriends ancient Iphone 6, and had it recording six stereo feeds within two minutes. Guess it's Apple or bust for this. Ordered an Iphone 12 Pro as a dedicated phone for this rig.
Stress tested it at home and seemed to work. Battery life on the TX-6 seems to last about eight hours total. Ordered little usb-c hub that will hopefully allow me to provide external power while it's running.
Took it out for first field test last night with Interrupters at local venue here in Sacramento. Ran six stereo monitor feed inputs to the TX6 (they only had six, so perfect setup). Seemed to work well! Only hiccup was when turning on the phone, it said it needed to connect to the app store before firing up the DAW app (Roland Zentracker). Had to turn on hotspot on my Android phone, and came through.
I made a little 1/8" cord snake. The spacing on the inputs is VERY tight, so you need the very slim cables to fit.
Monitoring was easy. Can adjust monitoring levels easily on the Zentracker program, which then sends the two channel mix back to the main headphone out on the TX-6.
All and all, very intriguing. Need to take out for a stealth pull next.