Synths and keyboards: audio, headphones and connections
Connect at least the main audio outputs and headphones. If your setup depends on particular ports, test those as well.
Depending on the model, check:
- L/R outputs;
- headphones;
- audio inputs;
- sustain and expression;
- MIDI DIN;
- USB;
- CV/Gate inputs and outputs;
- removable media slots where applicable.
Gently move connectors to check that the signal does not drop because of loose jacks.
You do not need to test a port you will never use, but connections that are critical to your setup should be verified before payment whenever possible.