i have been very busy the last months and i have done some changes. As you can see at the picture i have made a midi tower. The Roland Sound Canvas SC55 Mark I, Yamaha MU50 and Roland CM64 are connected with my Cyrix PC. The Roland Sound Canvas SC88 is connected with my Macintosh Performa 6116 via the Macman Macintosh Midi Interface and the sound in port of the computer. In order to use it, i have to go to sound in panel and choose the "microphone" option. Finally the Roland MT32 is connected on both computers via a Midiburner midi switch with 2 positions, A and B. One midi cable is connected with the MT32 and the central switch of the midi burner. Another midi cable is connected with the PC's pcmidi's card and the 'A' position of the switch and the 3rd midi cable is connected with the Macman Macintosh Interface and the "B" position of the switch. When i want to run a game with MT32 sound for Macintosh, i use the "B" position and when i want to use with the PC, i use the "A" position. I am at the job now but when i find free time at home i will take some pictures. I haven't tested the SC88 with the serial port as the manual mentions
Thank you. I am not a musician. I use the midi devices only for gaming because I've always technically loved the music and sound more than the graphics.