The Small Stone is a great fet-based phaser design with the MXR phase90 'like it or lumb it' single knob that controls rate as well as depth. There is also a switch that changes the voicing, I believe by changing the number of stages of phasing. I am not 100%.

Mine was a 2nd issue from the 70s. It was not true bypass or well buffered and was a real tonesucker when not engaged, so I modded it for true bypass. When I did so I found that the smalls tone suffered the classic 70s modulation stompbox volume drop. It was easily remedied with a few a tweaks that also improved the way the smalls tone interacted with the amp so that the upper harmonics at the top of its sweep would REALLY pop. I don't know if the current issue Small Stones are built this way, but if not they should be. All the right parts were in mine other than a DPDT footswitch.

The Small Stone is just great and has an instantly recognizable sound that is totally different than a Phase 90. Its hard to dial a bad sound in with the Small Stone with its 2 lousy controls. I just can't say enough good things about this pedal. Everyone should try a Small Stone against a phase 90 and a decent univibe clone. All 3 iconic tones and all so different.

One knob pedals are the best. The color switch allows you to switch between subtle phasing and drastic wide sweeps.

With synths it produces the well known Jean Michel Jarre pad sound as he used the small stone to process his synths. There are many versions available with small improvements. The newest version even got a smaller footprint.

Fo me it'a a great pedal, It's size mekes it go in any pedalboard without giving you a headache thinking where to place it. Great tone, works real great as the first and the end of your pedal chain.