The unit has the basic four functions that you would see out of most bass chorus pedals or even guitar chorus pedals. You have level, speed, depth, and HI EQ which that control features is somewhat unique to this pedal but certainly not as far as pedals in general go.
The level will switch your overall volume for the effects pedal. The speed will control how fast the modulation reacts in the unit. So if you turn it all the ay up you get a rotation sound like a leslie or a vibrato sound. The depth will control how the modulation effects the psectrum of the tone which essentially changes the 3D sound or how much the modulation covers the overall tone. Sort of like a mix knob but a bit different. The HI Eq will change the highs in the frequency which allows you to tailor the tone accordingly to your preferred bass guitar or the amp you are using. This feature sort of shapes you overall voicing and thickness of the pedal used.
I am not really that much of a fan of this pedal. Though while the pedal is certainly useful the overall tone is not that pleasing if you understand the nature of the chorus pedals in general. Chorus pedals have a lush watery quality to them that adds almost a second guitar or instrument to the tone. This pedal adds an effected signal but not in terms of what you might hear from more higher quality products.
The tone overall isn't the lush rich chorus tone that comes from say a EBS or Electro Harmonics pedal. Those tones within those pedals are much more usable in a bass rig. This pedal certainly is usable but you woulnd't want to feature this pedal or tone in your overall bass tone.
These pedals have since been discontinued and the used market is the only way to go to get one. You can find them well under $100 on the classifieds or ebay. I have seen them go for right around $70 or so. Not a bad price for this pedal to take a try and see if you enjoy the tone.
I would recommend this pedal to someone who needs an inexpensive bass chorus and only wants a subtle change in tone and not an overall dominant effects modulation to the rig.