Hey, thx for the replies. I will go and fetch my keyboard amp to do some more tests.

btw : guitar amps are not designed to play bass, they have a presence boost in the midrange and in the high frequency range, most of them don’t go past 10 kHz. There are several reasons why you shouldn’t use guitar amps to amplify your synthesizer sound.

Of course I don’t know yet what frequency range is cut off when going through the electro harmonix, a shame I don’t have a spectrum analyzer, would love to test it.