- Press the Master/Globals button.
- Select option 8 (Special).
- Select option 7 (Disable Channels).
- Ensure all channels are enabled (check display/status).
Source: Emulator III XPs — e-mu-emulator-iiixp-operations-manual (manual)
Symptoms this guide addresses
Source: Emulator III XPs — e-mu-emulator-iiixp-operations-manual (manual)