holding down the reverb switch delivers the infinite sustain as long as you hold the footswitch

The modulated signal gets louder when you turn it clockwise and quieter when you turn it counterclockwise

Now in 2015

The Crush Bass 25 houses a 8" speaker with a reflex port for improved low-end response

Electro-Harmonix C9 Organ Machine Category_Electric Guitars holding down the reverb switchElectro Harmonix C9 Organ Machine The new C9 Organ Machine springboards off the revolutionary B9 to mine another rich vein of classic gold and provide players with nine more definitive organ and keyboard sounds. The C9 will transform your instrument into a convincing full body, electric organ or vintage electronic keyboard. For each preset chosen, it also provides precise control over important elements of that sound's sonic fingerprint like