Logic Pro 9 Solo button deactivated?

[RichCee]

The solo button on one of the channel strips in the arrange window when 'off' has a diagonal red line across it. (The effect being that the track in question will play while other tracks are soloed despite the solo to this track being off - it can olny be silenced by muting the region/track).
How do it get the solo function to revert to normal and how did I contrive to make this happen in the first place?

Many thanks in anticipation.

Richard

 

[leytonnz]

its called "solo safe" .

hold ctrl and click on the solo button to get rid of the red line.

 

[Pete Thomas]

If it keeps coming back, you need to create an audio instrument no 256. Otherwise the highest numbered other audio channestrip will keep going into solo safe every time you reopen the project.

 

[RichCee]

Many thanks - much appreciated