Tuning with Cakewalk or Pro Tools

Hey guys,

I got the Pro Tools FREE off the net, and also just got Cakewalk... my
synth doens't retune, so to hear tunings I usually use MIDI RELAY, and
listen through the speaker, is there anyway to change the tuning of General
Midi, or retune through Cakewalk 9.0 or Pro Tools... just curious, looking
for some help... THANKS...

Steven