I picked up this USB powered mixer on wish dot com, yesterday. With a USB Power Bank Battery, this mixer is usable of the grid, without AC power. Channels 1 and 2 can be assigned +48V phantom power, affording condenser microphones and my LR Baggs Para Acoustic DI box with active preamplifier directly from the mixer. The 3RD USB/AUX/BlueTooth 3RD Stereo Channel has it's own independent bass and treble tone controls, allowing equalization on the BlueTooth Channel, which has been a highly requested feature for the Bose S1 Pro battery powered PA System. This mixer has a high quality delay assignable digital delay effect, built in. This mixer can also be assigned to use as a recording studio to input a PC/laptop. This mixer will also accept the USB audio output from a laptop or computer. I have been experimenting using the 1/8” headphone output of this mixer into the Channel 3 1/8” input of my Bose S1 Pro with outstanding results! I've included the owners manual here, so y'all can determine if this can remedy y'all dilemas.