www.tunnelvisionmusic.com - The M-288 Bass Octave Deluxe is a dual-voice octave pedal from MXR Bass Innovations that offers organic analog tone, true bypass, and a wide variety of tone-shaping options. Powered by a single 9-volt battery, MXRs 18-volt Constant Headroom Technology(TM) (CHT) provides studio-performance headroom and superior tracking. Use the Dry knob to mix your direct bass signal with the octave effect, or hit the Mid+ switch to add up to +15dB of internally adjustable low ...