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Checking bass output level

I play a Warwick thumb with the MEC J/J pickups. I got a new EBS IQ pedal the other day. I noticed that I was having trouble getting the filters to engage, like the bass output was too low to trigger it or the pedal was screwed. I pulled out my old Fender and the pedal worked fine and there was a noticeable increase in my volume through the amp.

I almost always run the Warwick with the tone controls at the notch position so I'm not cutting or boosting anything. I did have to have the circuit board worked on recently as a pot was messing up and I didn't notice anything when I got it back. I was wondering if there is an easy way to test the output of the bass (ie "signal strength") besides just the fact that it sounds quieter.

I also changed the battery out with a new one.
 
The fact that it sounds quieter is a pretty good indication that the output is lower in most cases! I don't remember about the MEC circuit specifically, but many onboard EQs have a small pot inside the cavity to adjust the output level. You might check yours to see if it does...

Mike