Wonderfully thought out switched capacitor filter. You can get some really diverse sounds from this thing feeding it's own VCO in, but I really like it when treating it like just a filter. It takes some getting used to thinking of the VCO frequency as the filter cutoff, but once you do, there's some delay in the PLL responding when the divisions are set high, and a little cv takes things to the moon. It's one of those modules you can set up, and then every little tweak can make a huge difference. Rewards experimentation. I've bought the last 2 to pop up on here, but I don't need both. Selling this one, serial 390, which will have been from the last batch they made. Listing includes Synchrodyne module, power cable, screws, original box with matching serial number, and I've made sure there are the jumpers on the back. Module will ship double-boxed.

From ModularGrid:

VCO + PLL + SC Filter

Containing several pieces to a traditional synthesizer voice, the Synchrodyne is a powerful addition to any subtractive oriented system. However, it is designed primarily as an experimental sound source/filter, intended to push the limits of modular synthesis.

• Front End Linear VCA
• Switchable Four Stage WaveFolder
• TempCo Saw-core VCO
• Linear (AC/DC) & Exponential (DC) FM
• Bipolar Attenuators for FM
• Calibrated 1V/Oct Input
• Hard Sync Input
• VCO Range ~.02Hz - >=400kHz
• Phase Locked Loop
• PLL Frequency Multiplier/Divider
• Variable Slew & Damping in PLL
• Switched Capacitor Filter
• Multimode Filter Output
• -12 and -24 dB/oct Output Taps
• Stable Self-Oscillation at -24dB/oct
• Voltage Control of Filter Resonance
• Single Stage WaveFolder on Outs
• 100% Analog/Discrete/CMOS
• power draw measured in 2021 with a joranalogue test3 - while idle, it hovers around +/- 80-90 mA, but will peak as high as +113/-100 under moderate cv control