RSD (and studiomaster, they were a bit confused) kit was the big step up from MM and HH. It was the price point at which one got sweep EQ. And where the lust moved to the TAC Scorpion. Lots of very decent pub and small club type PAs had the whole RSD electronics chain.
The channels on the desk were numbered backwards; there was an the expansion port on the left that was under a plate held on by a couple of screws, and expansion carts were available as a four channel unit.
At least the rotary controls were not put on upside down-like the "professional" Kustom consoles I used to have. I heard there were only 7 made, and at one time I had 3 of them.
There was a 5 band eq and the "0" position was at 6 oclock-not 12.
You still turned it to the right to boost-but the pointer was to the left.
It took some getting used to.
They also had a built in compressor on every channel and switchable high and low pass filters.
Pretty advanced at the time for a "club" type console.