I found an easy and fairly quick way to set up what I need. XFCE and Mate allow me to do this. Here's what I did:
1) I went into the Workplace Settings ( in the XFCE Settings Manager) and set the number of workspaces to 23. I kept Workspace 1 as my main, then added and renamed 22 others.. Each workspace now has the name of an individual tune, and in the order of my set list.
3) I then added the Workspace Switcher plugin to the panel to have a graphical representation.
4) I set the number of rows in the Workspace Switcher to 4, and enabled " Show miniature view".
5) Back in the Settings Manager, I opened the Keyboard tab in the Window Manager and set the "Next workspace" action to ALT-1 (which is already programmed into my pedal).
All of the above is a one time deal since it's saved in my session settings.
1) I open Audacity in Workspace 1 and all 22 tunes (22 Audacity windows open). On this note, I find Linux to be way faster than Windows, and XFCE faster than Cinnamon (3D and 2D), or Gnome 3. Haven't tried it in Mate.
2) I then move each open tune (Audacity window) to the workspace with the same name. This is easily and quickly done by right clicking the open tab in the panel and following the menu/drop-down box. It's this functionality that seems to be unique to XFCE.
I can now cycle though the tunes using my mouse wheel, mouse pointer on the panel, keyboard, and most importantly..... my pedal.
Mr. Lawrie Mann
Partition 1: Linux LMDE/Mate
Partition 2: Windows 8 Pro