[spkguitar]

You need to be using some sort of MIDI sound module, either an external hardware unit or a softsynth.

Most consumer computer sound cards have a GM sound module built in, but to use it, you would need to physically route the audio output of your computer's sound card to the audio inputs of your 1010 with an audio cable.

You can also use any number of softsynths that are readily available, though there aren't many that are GM, so you would have to manually re-assign most instruments when not using GM devices.