The original Octron, on which Octron2 was based. This is decribed on the official Octron2 product page.

Octron2 is a special version of the Foxrox Octron pedal with the addition of individual footswitches with LED for Octave up, Direct, and Octave down. Since its debut in 2005, the original Octron pedal has been hailed as a super-organic sounding, high-quality analog Octave pedal. Inspired by feedback from Mahogany Rush guitarist, Frank Marino, improvements were made to the original Octron to arrive at something cool, new and unique - Octron2.

The successor version, with an update being posted to the Octron2 product page on May 24, 2021.

The legendary Octron2 is being replaced by Octron4!!

Octron2 has been discontinued. If you came here looking for one, get on the Octron4 list. First come - first served. When there's an Octron4 ready to ship your way, you will be notified at the email address you provided. If you're not interested at that time, just ignore the email. If you already got on the Octron2 list, don't worry, it's the same list.

Availability - I'm aiming to get Octron4 into production before the end of summer 2021. The first run will be for 100 units. Inflation is hitting hard with higher prices for parts and other materials. The metal enclosures, especially. The price will be in the $330 - $420 range. That's just a guess, I will know when all of the parts are ordered.

For people who were looking for an Octron2, here are the differences:

Octron2 versus Octron4:

Both Octron2 and Octron4 are the same width: 5.5". I thought about squeezing the switches closer together, but determined the spacing was just right.

Octron2 is 4.8" deep, while Octron4 is 4.4" deep. It's smaller!

Octron2 has jacks for an effects loop that few people use. Octron4 does not offer the effects loop.

Octron2 functions the same as the original Octron. It offers Octave UP, Direct and Octave DOWN. Oct UP and DOWN have internal adjustments.

Octron4 functions the same as Octron3. Instead of internal adjustments, Octave UP and DOWN have tone switches on the front of the pedal.

Octron4: SUB is an additional signal that is made from dividing the note you play by a selection of 3 or 4.

Divide by 3 is the 5 note in the scale of the note you play, one and a half octaves down. Play E and you get a very low B.

Divide by 4 is the note you play, two octaves down.

The low octave foot switch controls both the Octave DOWN signal and the SUB signal. They are mixed prior to the switch.

Note: You cannot divide by 3 and 4 at the same time. You have to select one or the other.

I considered a 4th foot switch for SUB, but that would be overkill. The SUB signal is a bit of a novelty, and not that usable in most situations, but fun to be creative with. A big, fat low harmony in real time. Mix in some direct and Octave up and it's huge.