Using Hardware PC Knob

[schamass]

Hi Lily,
maybe the solution for your problem lies in between all this…
I see the difficulty to work with diffrent rackspaces when the ‘sound-engine’ (Synth-VST/Preset) has to stay the same and it must keep playing but the effect (Amplitube) after it has to be changed.
So @Pianopaul already showed you how to use a knob widget with PC-messages in this thread:

Changing Presets in Amplitube 4?

Also don’t forget the option to pass unused PC messages in general options so if you set up your Amplitube to respond to PC messages that are not used in GP it should work as well. Consider though why are you sending those PC messages into your plugin (Aplitube). Most likely you are switching the patch within the plugin. It is far better and more flexible to create a rackspace for each of your sounds. You get smooth transitions with tail length control and zero glitching in GP if you do it tha…

This in combination with the use of diffrent variations could do the trick actually.
With such a knob widget, you should be able to switch Amplitube to the desired Preset.
If you have found your preset, then store the rackspace with the actual knob-position as a new variation, which then gets a separate PC-number.
This way, you may store as many effect-variations as you need for playing this sound/rackspace.
Using your hardware-knob (which i suppose to send out PC-numbers), you can step through the variations (which have separate PC-numbers).

The trick is, that you dont’t use your hardware-knob to switch the Amplitube-presets directly, but to switch the variations, which have a widget (the ‘PC-knob’) that is set to a PC-number which is then sent to Amplitube. Got it?
You don’t have to connect your hardwar knob to the knob-widget - the widget works for it self. Let the variations do the job for you.
And because the Synth-VST doesn’t receive any changes, the ‘basic’ sound should keep playing on while you switch the effect by changing the rackspace-variations.