will an ETC Expression 3 work with an Insight 3 LPC?

I think it will depend on how your Insight 3 LPC was being used.

I'm assuming you are trying to replace an Insight3 with an Expression 3 unit.  If the reverse is the case, what I'm saying may not apply.

If I recall right, the one time I tried replacing an Insight 3 device with an Expression 3, the limiting factor was any subs created beyond 24 were lost.  While the Expression has 10 pages of subs, I believe the Insight does as well, creating up to 1080 subs.   The Expression doesn't know what to do with those extra subs, so it just truncates them.   If you are just doing cues and the like, it should transfer fine, based on channel counts, etc.  If you are going from Expression 3 to Insight, I think it should do fine as well.   If I'm wrong, I hope someone will correct me as needed.

Good Luck.

There could be limitations going from Expression 3 to Insight 3 as well... The Expression 3 has 400, 800, or 1200 channels, while the Insight has 512.  So if you're using more than 512 channels on the Expression 3, you'll lose them on the Insight 3, much in the same way you'd lose Submasters going the opposite way.

My entire post was to ask if I could use the Insight 3 LPC as a tracking backup for the Expression 3.....Srry I meant to fix that, but Totally forgot about it!

My entire post was to ask if I could use the Insight 3 LPC as a tracking backup for the Expression 3.....Srry I meant to fix that, but Totally forgot about it!