Maybe this is common knowlege, but here goes:

In cakewalk, the MIDI tracks each have reverb and chorus sliders. These in fact are continuous controllers (CC#91 and CC#93). This allows you to use them to control various parameters in your MIDI software or hardware. For instance, Gigastudio has reverb, chorus, delay and eq effect processors. For any parameter, you can assign it a MIDI CC# (by right clicking the param). Since you know cakewalk\'s reverb slider is CC#91, you can assign delay level (for instance) to CC#91 and control that param in cakewalk. It is really convenient especially when mixing MIDI tracks in cakewalk. Otherwise you always have to have Gigastudio in front of you and have to access its effects modules.