Every function tested except the USB link as the software is no longer supported by Great River. You can still set the summing mixer levels/pan from the front panel. I graded it as "very good" because there is a small amount of noise when turning some knobs and the fader, they're mostly quiet when turning though. There is some odor of cigarette smoke (only on the Mixmaster unit, not on the PSU). There are some scratches consistent with normal wear.

Includes an upgraded power supply (original supply not included.) Dan Kennedy, one of the owners of Great River recommended Acopian linear regulated supplies so I wired the pair up according to the specs he gave me. These Acopian supplies are very low ripple, only 0.25 mV rms, which means ultra low noise. The original supply was switch mode (with filtering). The power supplies retail for over $800 total on Acopian's site. One of the power supplies has some dents but it does not affect operation. They have a 6 foot "Y" style power cord connected to AC, so there is only one power cord that is connected to the two supplies. The power cable that connects the PSU to the Mixmaster is just under 10 feet long. The supplies are bolted to a 19 inch rack shelf. The 120V connections are covered with electronic grade silicone for safety.

Note to buyer: the power supplies are adjustable 0-30V. There are pots on the front panels to adjust the voltage. While it will be packed with care, it is possible that the pots could get moved in shipping. When you receive them, before connecting the PSU to the Mixmaster you should verify the voltage of each one with a multimeter and adjust if needed from the front panel pots, if you need step by step instructions on how to do so I can walk you through it, it is easy and can be done with a cheap multimeter. Once they are set you do not need to adjust them anymore.

I will pack the mixer and PSU with care.