Check out more info on the Hammond B-3X demo here:
https://www.ikmultimedia.com/faq/?id=798This can be used to try out the different settings in the app. If you are having troubles getting a clean sound from your Hammond preset, try rolling back your Expression Pedal. This will act similarly to a guitar player's volume knob. If this doesn't help try the Normal/Soft volume switch on the Hammond interface itself. From here you're Stomp FX will really take over for volume, so check that your Overscream overdrive peal isn't enabled and no signals are boosted on your EQ.