completely new or modified sounds, with additional sounds having been added to drum channel 10. Despite this, compatibility with GM is still limited by the lack of parts (9 on the MT-32, 16 per GM specification) and reversed panpot compared to MMA MIDI specifications. The utility was predated by a pack called "MT32GS", released by Mike Cornelius in 1992. The CM-Panion, by Gajits Music Software, was an Amiga editor which worked with the MT-32. MT-32 models Two major revisions of the MT-32 were produced. Roland refers to them as MT-32 (Old / Without headphones) and MT-32 (New / With headphones). MT-32 (old) The LA32 sound generation chip is an 80-pin PGA. The control CPU is an Intel C8095-90 in ceramic DIP-48 package. The digital-to-analog converter (DAC) is a Burr-Brown PCM54; the input signal having a resolution of 15 bits (see below). Line-outs are unbalanced 1/4″ TS phone connector (separate left and right channels.) No headphone jack. MT-32 with revision 0 PCB, used in units up to serial number 851399. The PGA LA32 chip is later replaced with a 100-pin QFP type. MT-32 with "old-type" revision 1 PCB, used in units with serial numbers 851400 - 950499. MT-32 (new) The control CPU is an Intel P8098. Same Digital-to-analog converter (DAC), but with 16 bits of input signal resolution (see below). A stereo 1/4″ TRS headphones jack is added. MT-32 with "new-type" revision 1 PCB, used in units with serial numbers 950500 and up. Roland MT-100: Combination of MT-32 and Roland PR-100 (Sequencer and 2.8" Quick-Disk). While it uses a MT-32 (New) PCB, the chassis is different. MT-32 (Old) that have had the mainboard replaced by Roland because of a repair can contain the MT-32 (New) mainboard, with the headphone jack removed. MT-32 compatible models To target computer users, Roland released a number of CM (Computer Music) modules. They came without an LCD display and had most buttons removed. CM modules are compatible with MT-32, but feature 33 additional sound effect samples which many games took advantage of. These sound effects cannot be heard on an MT-32. Early models share a similar design to MT-32 (New). Control CPU is an Intel P8098 and DAC is a Burr-Brown PCM54. Roland CM-32L: Released in 1989, this Roland CM has only a volume knob, a MIDI message and a power-on indicator as external controls. Roland CM-64: A combination of the CM-32L with the sample-based CM-32P,