A straightforward solution for synching up your classic drum machines and synths to a MIDI clock

SYNCHOLE takes a single MIDI input, extracts the clock and transport messages, and generates five identical DIN SYNC (SYNC24) outputs.

Use it to synchronize classic drum machines, synths, sequencers etc which have a DIN SYNC input but which lack MIDI completely or which cannot slave to a MIDI clock.

SYNCHOLE is supplied as a fully assembled and tested unit - no assembly is required

SYNCHOLE generates standard SYNC24 signals - so it uses the incoming MIDI clock to generate a 24 pulse per quarter note (ppqn) clock (5 volt peak, 50% duty) on pin 3 of the 5-pin DIN connector. It uses the MIDI start/stop/continue messages to switch a 5V "running" signal on pin 1. Manufacturer-specific extensions on pins 5 and 4 (e.g. Fill in and Reset) are not supported.

The full spec is

• A single MIDI input connection via 5-pin DIN connector. Optically isolated per MIDI standard.
• Alternatively you can connect MIDI input via a stereo 3.5mm jack with "hot" tip (used by Novation, Arturia and others but not Korg). The 3.5mm MIDI input is an alternative to the 5-pin DIN connector (don't try to use both at the same time!). To use a 3.5mm MIDI from a Korg device you'll need a cable that crosses over tip and ring - or just use the DIN input instead.
• A single midi thru connection. This is a 5-pin DIN output that mirrors what appears at the input. MIDI thru is electronically buffered but not processed in firmware, so offers near zero latency on the MIDI signal passing through the device.
• Five identical, electrically buffered, SYNC24 outputs via 5-pin DIN connectors
• An Activity LED which indicates that a MIDI clock is present
• A Beat LED which blinks once per beat (quarter note) when the DIN SYNC output is in the running state.
• A Power LED which is lit when the unit is powered
• A Run Button which enables manual stop and start of the DIN SYNC output

The unit requires a power supply (not supplied) of between 9V and 12V via a 2.1mm barrel type connector (such as a guitar stomp box supply). Both positive tip and negative tip supplies can be used.

All connections are made from the front of the unit, allowing it to be fitted into a studio panel / flight case foam etc.

The enclosure is made of laser cut 3mm acrylic panels, with 5mm acrylic end pieces and a laser-etched acrylic front panel. Size is approx 180mm x 55mm x 28mm and weight is 175g