ALM Busy Circuits PPX2 (2018–)
An expander that turns Pamela's Pro Workout into a master clock for the whole rack - MIDI, DIN Sync, and fixed clock triggers, all in 2HP.
Overview
Once a modular setup grows to a drum module, a couple of synths and maybe a hardware sequencer, Pamela's Pro Workout starts to get stretched thin. The PPX2 is built for that. It doesn't generate notes or warp waveforms. It has no LEDs and no touch controls. It takes the clock from Pamela's Pro Workout and gives it dedicated, buffered outputs for MIDI clock, DIN Sync, and multiple fixed clock divisions. That frees up Pamela's main outputs for other jobs. It's infrastructure.
The PPX2 is officially the PPEXP-2 Pro. It's the evolved version of ALM's earlier PPEXP-1 and PPEXP-2 expanders, designed for the Pro version of Pamela's Workout (not the original "NEW Workout"). It plugs into the MIDI-EX header on the back of the module, draws minimal power and adds just 2HP to your case. The buffered x24 clock and Run outputs can drive long cable runs or multiple DIN Sync devices, like vintage Roland gear, without signal degradation. The 3.5mm TRS MIDI output sends clock and transport signals. A switch on the back selects Type A or Type B, so it works with a wide range of hardware. Because the outputs are buffered, they don't load down Pamela's internal circuits.
It’s not the kind of module you show off. It’s the one you install and then forget—until you realize you haven’t had a dropped beat in months. It’s the difference between a system that *mostly* stays in time and one that locks in like a drum machine from 1983. And while it doesn’t add new functionality like extra gate outs or reset triggers (that was the PPEXP-1), the PPX2 focuses on doing the core timing job flawlessly. It’s not for everyone—only those already deep in the Pamela ecosystem—but if you’re syncing external gear or running a hybrid setup, it’s not just useful. It’s essential.
Specifications
| Manufacturer | ALM Busy Circuits |
| Model | PPX2 (PPEXP-2 Pro) |
| Production Years | 2018– |
| Module Format | Eurorack |
| Width | 2HP |
| Depth | 32mm |
| +12V Current Draw | 20mA |
| -12V Current Draw | 0mA |
| +5V Current Draw | 0mA |
| Power Connection | MIDI-EX header (from Pamela’s Pro Workout) |
| Outputs | 3.5mm TRS MIDI Clock/Transport, x24 Clock (DIN Sync), Run (DIN Sync) |
| MIDI Implementation | Selectable Type A or Type B via rear switch |
| Compatibility | Pamela’s PRO Workout only |
| Mounting | Front panel with M3 screws |
| Color | Black anodized aluminum panel |
| Weight | Approx. 30g |
Key Features
Built for Rock-Solid Timing Sync
The PPX2 works as a dedicated sync hub. Pamela's Pro Workout already has MIDI and DIN Sync capabilities, but routing those signals through its main outputs can cause timing jitter or loading issues when driving multiple devices. The PPX2 provides buffered outputs, meaning the signal is amplified and isolated, so it can travel longer distances and split to multiple destinations. The x24 clock output suits vintage drum machines like the Roland TR-707, TR-808 or TB-303, which rely on 24ppqn (pulses per quarter note) timing. The Run signal handles start/stop transport, so external gear starts and stops together. Everything is derived directly from Pamela's internal clock, so there's no latency or drift.
Direct Integration, No Clutter
The PPX2 connects directly to the MIDI-EX header on the back of Pamela's Pro Workout. No patch cables, breakout boards or external power are needed. The connection is internal, which keeps the front panel tidy. It also means the PPX2 takes up no additional patch points on your module. It's skiff-friendly, with a low-profile design and no protruding connectors on the front. The only user control is a small switch on the rear that toggles between MIDI Type A and Type B (Type A sends MIDI clock on all channels, Type B sends it on a specific channel).
MIDI Done Right
The 3.5mm TRS MIDI output uses proper TRS MIDI protocol, unlike some DIY or budget MIDI solutions that use unbalanced signals or require special cables. It sends clock, start, stop and continue messages. You can connect directly to any modern hardware synth, drum machine or sequencer with a MIDI DIN input using a standard 3.5mm TRS to 5-pin DIN cable. The signal is hot-swappable and resistant to noise, which helps in a modular environment where ground loops and interference are common. It's derived from Pamela's clock engine, so the timing is tight, with no wobble and no drift.
Historical Context
The PPX2 emerged in the late 2010s, when Eurorack was shifting from boutique curiosity to mainstream staple in electronic music production. More musicians were building hybrid setups, mixing modular with classic hardware, and demand grew for reliable clock distribution. Pamela's Pro Workout, released in 2017, quickly became the go-to master clock for its rhythmic flexibility and swing algorithms. Its original design didn't include dedicated external sync outputs, so users had to patch internal signals or rely on less stable workarounds. ALM Busy Circuits, known for a no-frills, function-first approach, responded with the PPEXP-1 and PPEXP-2 expanders. The PPX2 (PPEXP-2 Pro) refined that concept, dropping the extra gate outputs of the PPEXP-1 for a more focused sync solution. It arrived while DIN Sync was enjoying a revival, thanks to reissues of Roland's Boutique series and renewed interest in vintage gear. Competitors like Intellijel's PentaCart or Doepfer's MM-4 offered broader MIDI integration, but none matched the PPX2's simplicity and direct coupling with Pamela's engine.
Collectibility & Value
The PPX2 isn’t a collectible in the traditional sense—it’s not rare, not flashy, and not likely to appreciate in value. But it is *valuable*, especially to those running Pamela’s Pro Workout in a serious setup. New units typically sell for around $115, reflecting its niche but essential role. Used prices range from $80 to $100, depending on condition and whether it includes the optional MIDI cable (though most users already have one). Because it has no moving parts, no potentiometers, and minimal circuitry, failure rates are extremely low. The most common issue is damage to the MIDI-EX header during installation, usually from misalignment or overtightening the mounting screws. Technicians advise handling the module carefully during installation and ensuring the header is fully seated before securing it. There are no known firmware updates or revisions—what you buy today is identical to units from 2018. For buyers, the main check is compatibility: the PPX2 only works with the *Pro* version of Pamela’s Workout, not the original “NEW Workout.” Attempting to use it with the wrong module will result in no connection and potential damage. If you’re investing in a Pamela-based rig, the PPX2 isn’t an optional extra. It’s part of the foundation.
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