I just found something pretty cool.

Once you load a performance, or just load so many patches into GST...
1. Go to \"Loaded Instruments\" tab
2. Select a MIDI channel (so the little green light comes on)
3. Double click on one of the instruments from the list below
4. The instrument is loaded into that channel

In the channel window
1. L-click and drag up. The channel is unloaded.

2. L-click and drag down (slowly). The patch will change to the next higher numbered patch available, when it reaches it. If you have gaps in the patch numbers loaded, you won\'t see a change til you get to the point where the patch should be.

Hope this helps somebody. I know I have seen a few questions about this.