Moby Dick


The MK-04 is a chorus-effect especially designed for bass guitar. The typical chorus-sound is produced by adding a modulated delay-signal to the original dry-signal. All parameters and specifications of the device are set to perfectly fit the needs of bass-instruments. Its multiple regulation possibilities allow a wide array of different chorussounds.

Most guitarists know that True Bypass switching is needed to prevent tone sucking when an effect is not in use; but most True Bypass systems create as many problems as they solve. The Exar Silent True Bypass perfects the art of effect switching. Standard True Bypass systems are based around the mechanical switch. This is a simple and low cost method, but poor reliability, clicking and popping during switching, low quality signal transfer can all be a significant problem. The Exar Silent True Bypass substitutes the unreliable mechanical switch with a jointless magnetic switch, microprocessor and relay, which is practically indestructible. Clicking and popping during switching is eliminated using an innovative microprocessor controlled circuit design. In the space of just a few milliseconds, the signal is short-circuited, the micro-relay contacts are switched, and then the signal is re-connected again. This process is unnoticeable and provides you with noiseless switching of every single effect. Switching is done by a special micro-relay with 24 carat gold-plated contacts providing much better signal transfer. This micro-relay uses very little current and only while switching, so it has almost no effect on battery life. All the benefits of standard True Bypass without any of the problems; the Exar Silent True Bypass sets the new standard.

Weight400 g
Output Impedance10 kOhm
Input Impedance1 Mohm
Size60x110x50 mm
Current Draw12 mA
Power Supply9V DC
rate: Regulation of the frequency of the LFO-Generator.
depth: Adjustment of the depth of the effect.
tone: Adjustment of the overall tone colour.
e.level: Adjusts the effect level in relation to the output signal level.


I have heard about the Exar guitar effect pedals many times. In fact, I have never been interested in checking them being convinced that I am in use of the world's best ones. In 2008, during Bass Days fair, I was asked to state my opinion about the Moby Dick chorus. I simply switched it on and I was extremely surprised.This chorus did not change the timbre of my guitar and there was no impression of receding sound. Till that moment, I believed it was rather impossible to achieve. I could not quickly regulate volume control before, using the other brand pedals. True Bypass is definitely not only TRUE because of the name given. When I tested Moby Dick thoroughly I decided to use it on stage. Is really amazing. I am using it constantly and I am really satisfied with the sound and the quality.