OK, so here's some help for those out there who have this pedal, like myself, and wonder what the knobs do. I don't think our host got it quite right (no offense intended - keep on making your videos, brother!). Nearly ALL comp pedals have VOLUME and COMPRESSION knobs. Some allow you to adjust the ATTACK (these are the kind that let your notes/chords 'bloom'). What sets this pedal apart is that it has a GAIN knob and a SENSE knob as well. VOLUME is the output volume. COMP is the amount of compression, or just how much your quieter playing will get louder (or your louder playing with get quieter - Einstein's theory of dynamic relativity?). Some pedals allow you to adjust the compression ratio and they have Ratio knobs instead. Some pedals have a Slope knob that is similar to ratio. It's hard to explain what's happening without a white board... ATTACK is how long it takes before the compression starts. All the way counter clockwise and the compression starts immediately. All the way clockwise and it starts later - play with this one along with volume and comp and you can get your notes/chords to 'bloom', which means get louder and fuller and more compressed as they sustain. SENSE is sensitivity. It's the volume threshold level that the note must reach before the compression begins (and ends). If you're holding out long notes, as your note's volume drops below the threshold level, the compression ends. So in a way this acts like the Release knob on some other bass compressors. Be sure to read the 'caveat' section below... GAIN is just like the input gain on an amp, it adjusts the volume level going into the pedal. Having this in addition to the SENSE knob is what's odd, because if you raise the sensitivity, which lowers the threshold, well, that's very much like raising the gain. Again, relativity applies. I think they added this to the pedal for players who like to switch instruments while playing live. Your p-bass probably doesn't have the same output volume as your jazz bass. So what you do is find the two gain settings that work for each bass guitar leaving the other knobs alone. You switch basses, then you adjust the gain and none of the other knobs need to be adjusted. In fact this is a great feature to have on a compressor, since a compressor is typically the first pedal in your chain. This allows you to use multiple instruments without having to adjust the input / gain levels on any of your other pedals in the chain! You can leave the gain knobs alone on your fuzz boxes and distortions and your envelope filters. AND your compressor will behave the same way with all your basses. Pretty cool. Caveat: Having the SENSE knob implies that this pedal is more of a "LIMITER" than a "COMPRESSOR". The way tubes respond when a note reaches the threshold is a form of limiting. It's a kind of "soft limiting" that doesn't just cut off the top of the waveform with a flat line, so it sounds "rounded" and smooth. Now, your typical distortion/fuzz pedals act like a "hard limiter" - they chop the top of the wave form very abruptly. When you really overload a distortion/fuzz pedal, the wave form stops looking like a sin wave and starts looking like a square wave. This being a bass pedal, and this pedal not being called a distortion pedal, means its trying to approach compression/limiting more like a tube, leaving the notes round and warm. I hope that helps! UPDATE AFTER PLAYING WITH IT FOR A COUPLE OF HOURS AND COMPARING TO OTHER COMPRESSORS I HAVE Firstly, it doesn't compress a ton like some comps do. Keeping your compressed signal at unity gain never really gets the unit noisy with hiss. I did all my testing with various knob settings keeping the pedal at audible unity gain with my dry signal. And I had a buffered pedal in my chain so there was no signal loss either (actually it was a BBE Opto Stomp - one of the units I was comparing it to). Secondly, I think that GAIN knob is there for the reason I said, to allow you to match basses with the pedal without having to change the other knobs. Thirdly, I have a PJ Bass with Alumitones in it - very wide range freq response but not super hot. For me I had to put the GAIN all the way up and the SENSE at 3 o'clock or higher to get any real compression going on, but once I did that the unit behaved as expected in regard to the other knobs. And the GAIN and SENSE knobs do seem to interact the way I described above - if I turned down the gain, I'd lose the compression aspect and volume would drop - if I turned down the sensitivity, I'd lose the compression and the volume would go up. So yes, it's acting like a soft limiter in many ways. The SETTINGS I FOUND BEST were: COMP at max, ATTACK at 9 o'clock (to get the snap when you strike the string - but fully counter clockwise sounded good, too), SENSE at 3 o'clock or higher, GAIN at max, VOLUME at 3 o'clock, but that was with my bass trying to achieve unity gain. Raise yours to taste, of course. Set this way, this compressor sounded GREAT. It was better for bass than all the others I A/Bed it with: the BBE Opto Stomp (that guy just didn't compress enough to keep up w bass bass playing dynamics), the MXR Dyna Comp, the DOD Milkbox Compressor, and the Joyo Dyna Compressor. Surprisingly, the Joyo Dyna Compressor sounded 2nd best. You really can get good gear for cheap from China these days!

I like your demo. Simple and shows me and lets me hear the effect of the different dials better than many other compressor demos! Good job! :-)

BASS player here, thanks man!!! I could hear it compress, looking for a squashier tone......

Fantastic pedal for the price especially after reading Super Pup's comment...

I think you miss the mark on what compression really is. If you hit multiple high and low notes at once or hit a (chord) you would be able to actually hear the blend and those higher and low notes being clearly heard in the mix especially in live performance. I think you failed at properly giving a good sample how good the pedal is. Good video though.

CP-45 or Hotone B Station what better?

May i know what is the power supply you use? And what is the polarity. Thank you!

what is the purpose of sense ?

How does it sound good on a non-bass guitar

Me llega en una semana mas no si si la cage en comprar este compresor pero párese estoy conforme

I appreciate your doing this video, but a bass player really needs to do the demo. Sorry. Bass technique is very different than guitar technique. I still don't know how it would sound in the hands of a bassist, playing real bass lines.

Friendly suggestion: if you are not a bass player and don't even know how to play one - stick with *not making a review of a bass product*.

Sorry, but you obviously didn't understand how a compressor works and what Attack, Sense, Gain, and Comp do with the sound. How do you control sustain when a knob labeled "Sustain" is missing? Your helpless fiddling around with the compressor isn't very helpful. Thumbs down!