I am having problems playing MIDI.

The MIDI play, but you can't hear them. I checked the synth volume on the audio controls, but it isn't muted. What could be the problem?

I am using Windows ME.

What soundcard you have? Is it integrated (onboard) or add-on type?

If its an on-board type then look in CMOS settings. You need to enable MIDI IRQ and DMA. If its a add-on card then try re-installing drivers.