Gigastudio works together with your sequencer volume. When you set a track volume to 127 in Cakewalk for instance, the volume in Giga will play at 127 (ex: while the song is playing, switch back over to Giga and check your level, it should be 127 instead of 90).
The minute you stop the song from playing on your sequencer, Giga defaults back to 90.
90\'s just a comfortable number when you begin arranging a piece. There\'s nothing like getting half way through writing something and loading a sound which has a whimpy volume level and then having to evenly ramp all your other levels (which were around 127) down so that they don\'t overpower the softer new sound.
My old Roland sampler used to default to 127 on everything and eventually I ended up manually setting every newly loaded sound to 90 just so that I didn\'t have to do major housekeeping if I sampled a sound which spoke softly. In the long run it\'s a real convenience.
Just remember that Giga\'s 90 is the same as midi CC 07\'s 90 and you can use any midi volume controller to set it to 127.
You can probably set your own personal default performance to load so that all 64 channels are set at 127 anyway.