1. Regarding your feedback of Mixer screen problem/change, we will review if it is possible to implement that in the next release.
2. When you playback in Multitrack pre/post mode, are you connecting your cymatic device (or any interface that can handle as many tracks as you are playing) to the computer using USB? The idea behind having these new playback modes was for the users to check their multitrack songs directly on the device without having to export the songs to USB drive.
If you want to use the Multitrack pre/post playback mode, connect your Cymatic device to the PC using USB wire (do not connect the USB drive in the front panel). Select the output device in the uTool Settings tab.