Can I use MIDI to alter VST Instrument parameters in real time?
This depends on the individual instrument, but nearly all will respond in some way to pitchbend, modulation and aftertouch. Most will also let you control at least some of their front-panel parameters externally, for the purposes of automation. Normally you’ll find a list in the Instrument’s manual of the MIDI Controller numbers allocated to each parameter, so all you have to do is generate the appropriate MIDI information to move each control on the screen — recording these controllers allows you to automate things like filter sweeps. Conversely, moving the software controls will normally generate similar MIDI information, so that you can create automation data using only a mouse. Unfortunately, Logic Audio already uses Controller numbers 64 through to 120 for its plug-in automation, so if the VST Instrument also uses any of these then things may work slightly differently — often MIDI control will still be available, but using altered controller numbers. You can find translation tab
