You can automate parameters in Trash using host
applications which support effects automation.
Automation allows you to specify changes to parameters over the duration of a mix, including all node positions in any Trash module as well as all Smear module settings.
The implementation and specifics of automation are dependent on the host application, so we refer you to the documentation of the host app for setting up an automated mix. In general, though, you patch Trash as an ordinary effect on a track, then in the track view of the host app assign automation envelopes to it. These envelopes control how Trash parameters are changed over the course of the mix. In this case, most of your "tweaking" is done in the track view of the host app, dragging curves and envelopes as opposed to changing controls in Trash.
Notes specific to Trash automation:
1) Keeping track of all the parameters. We've done our best to provide the controls with intelligent names, but it can be overwhelming when you initially see the list of automatable parameters in Trash.
2) CPU. It does take more CPU to run the Trash under automatable control. Under the Options screen in Trash, you can control how often automation is updated with the Automation Interval slider. In preview mode, larger intervals will use less CPU power. For mixdown, you can specify shorter intervals.
3) When you automate a control from the track view, you can see the control on the Trash interface move under the control of the host application. We purposely don't update the position of the control as often as we could. It takes CPU to redraw controls and it takes CPU to process audio. So we update the drawing of the control less frequently.
4) When automating in a track view with envelopes, but working mainly with the Trash interface, we found it helpful to be able to "see through" Trash so you can monitor Trash meters and controls but see the track view and automation curves behind Trash. So we provide an Opacity slider in the main options dialog. This allows you to see through Trash to monitor both what Trash is doing and what is happening with the automation curves. Note that this does require more CPU than a standard "opaque" plug-in if you set the Opacity to less than 100.
Note: This help file is a quick reference for basic Trash functions and controls. We have separate "how to" guides that provide tips and techniques for getting the most out of Trash. You can download these guides from http://www.izotope.com/products/audio/trash/guides.html