Vintage Synth Repair

Hi,

I have an Electra 368, and I found the output to be very quiet.
I added Fender Blender and I am using the Pre-amp part of the pedal, 
it definetely boosted the sound, however it is not a very clean sound.
I haven't changed the battery in the pedal yet, so I will try that 
first. Also, if you try and use the fuzz part of the pedal, you lose 
power on your output.

thanks.

cheers !!

M.