Volume pedal / effects loop

[derekfrank]

I have a bass amp with built-in effects, and I'm using a stereo volume pedal directly in the effects loop to have a post-effects master volume. The volume with the pedal all the way up is significantly lower than the volume without the pedal/effects loop (dry). any ideas on why this is, or any solutions to this problem would be greatly appreciated. thanks! oh yeah, and it is the 25k pedal.

 

[sandaas]

What brand and model is the amp?
Is the FX-loop a line-level loop?

 

[derekfrank]

It's an SWR Mo Bass amp, and the manual doesn't specify if it is a line level effects loop. this is all it says:
Stereo Effects (EFX) Loop
As noted in the External Effects Blend Controls section of the manual, the Mo' Bass is equipped with a TRUE STEREO
External Effects Loop. You can now use an external effects unit to affect the channel(s) of your choosing (clean/left or
wet/right in Dual Mode; either or both in Single Channel Mode). Please refer to the External Effects Blend Controls section
of the manual for basic connection instructions and operation with the front panel Blend Controls. The information in this
section is meant to supplement that previous section.
Using The Stereo External Effects Loop
The Preamp Volume control acts as the closest thing to an overall effects send level control. The amount of signal present at
the Left and Right Effects Send jacks is governed by the Preamp Volume and various internal effects settings on the front
panel. The signal essentially goes through the entire front panel and heads for the Effects Send jacks just after the
Chorus section. Then the signal returns just before the Master section and is blended in to your taste (using the External
Effects Blend Controls). The Stereo Master Volume Controls will NOT affect the level of your Left and Right Effect Sends.
However, the Stereo Master Volume Controls may be used to recover losses in gain caused by some effects units.
If your effects unit is overloading and it does not provide for compensating incoming signals - such as an input volume, or
switches marked +4 dB or -20 dB - you may want to turn down the Preamp Volume control to avoid the overloading. If your
effects unit has input level adjustments, they should be set for either 0 dB or +4 dB.

thanks!