I have a colour leaflet for the ACES MT series multitrack machines in my file - together with a schematic of the channel module.
I will scan this later and send it to you. Back in the '80s I used to look after one of these machines - and it must be admitted that it was pile of do do - the passage of 20+ years will not have helped improve it I fancy!
The main problems were mechanical, as I remember, with particular problems with the control of the actuating solenoids. Seriously - if you want to commit to analogue magnetic recording - don't waste any time on this machine, buy a secondhand Studer or 'name' machine of high repute!
John G