I have a subtractor in a song I'm working on that has an unusual habit; it likes to increase the 'amount' parameter on LFO 1 at random. Here's what I mean: I have it set to 0, but every two measures or so during playback, it will suddenly jump up to around 61. If I shove it back down, it waits a bar or so and then jumps back up. There is no automation on the parameter.

I've experimented to try and isolate the cause, and I've found that it stops happening if a solo the track in question. When I start bringing the other tracks, in, it starts happening again. Any thoughts?

Do you have a midi controller connected? It might be sending out stray data.

I do have a controller hooked up - how would I figure out if it was sending extraneous data? And why would it only be affecting one parameter on one instrument in this song?

Well, unplug the controller, restart Reason and see if it still happens.

For example, my Keystation Pro has a loose fader and if I shake my desk a little, it sends out a stray value, which happens to be mapped to the filter frequency. Very annoying.

Has there been any parameter automation?

I had problems a while ago with a deleted automation that kept affecting the track. I solved it by copying everything to a new project file in Reason...

I turned all the knobs on my midi controller to zero and the problem seems to have stopped. Hopefully that was the solution! Thanks for the help.