ALM PEXP-1 (2017–Present)

That moment when your modular rack suddenly syncs flawlessly with a battered TR-808 and a Digitakt—this little expander makes the digital handshake feel like magic.

Overview

Pamela’s New Workout is already a legend in Eurorack circles—the kind of module that makes you rethink how sequencing and clocking should work. But out of the box, it holds back one critical trick: dedicated external clock outputs. You can jury-rig a MIDI clock from a CV/gate output, sure, but it’s a compromise. That’s where the PEXP-1 steps in, not with fanfare, but with surgical precision. It’s not a new brain—it’s a nervous system upgrade. Plug it into the back of your Pam, and suddenly you’ve got rock-solid MIDI Clock and DIN Sync outputs, plus four additional buffered gate outputs locked to fixed divisions of the master clock: x1, x2, x4, and /4. No menus, no setup, no drift. Just sync, clean and authoritative.

This isn’t a module that announces itself with flashing lights or complex patching. It’s the quiet enforcer in the back row, making sure everything else stays in time. Want to drive a Roland SH-101’s arpeggiator via DIN Sync while sending MIDI Clock to a Digitakt and using the /4 output to trigger a sample on an Elektron box? Done. The PEXP-1 turns Pamela’s New Workout from a brilliant internal clock manager into a full-blown synchronization hub. And because it draws power directly from the expander header—25mA at +12V, nothing from -12V or 5V—it doesn’t tax your power supply unnecessarily. At just 4HP, it’s a space-saving powerhouse, though it does demand physical real estate on the back of your Pam, meaning you can’t stack other expanders or use a rear panel passthrough if you install it.

Owners report that the DIN Sync output is especially welcome for integrating vintage gear—Roland’s 30-series synths, early drum machines, even Korg’s SQ-1 or Volca line—without needing extra conversion modules. The MIDI output is equally solid, with no jitter or latency that could throw off tempo-sensitive devices. And those extra gate outputs? They’re not just clones—they’re buffered, so they won’t load down the internal clock signals, and they’re fixed, meaning they always track the master clock regardless of what the sequencer is doing. That’s crucial if you’re using Pam’s advanced step logic or probability features on the main outputs but still need a clean, predictable clock for external gear.

Specifications

Key Features

Dedicated MIDI & DIN Sync Outputs

Most clock modules make you choose: send MIDI via a general-purpose output or use a separate interface. The PEXP-1 cuts through that clutter with two dedicated physical outputs—MIDI and DIN Sync—both driven directly from the master clock engine. No re-patching, no configuration. The DIN Sync runs at 24 pulses per quarter note, the standard for Roland gear from the 80s, making it plug-and-play with TB-303s, TR-606s, and SH-101s. The MIDI output transmits standard clock messages without start/stop filtering, so it plays nice with modern grooveboxes and DAWs. Unlike some DIY solutions, there’s no jitter or timing drift—service technicians observe that the timing is derived directly from Pam’s internal clock generator, giving it the same rock-solid precision.

Four Buffered Fixed Gate Outputs

While Pamela’s main outputs are fully programmable—each step can be inverted, delayed, or randomized—the PEXP-1’s gate outputs are intentionally static: x1 (full clock), x2 (double time), x4 (quadruple time), and /4 (quarter-note divisions). These are buffered, meaning they can drive multiple inputs without signal degradation, and they’re always active, regardless of what the sequencer is doing. This lets users offload basic clock distribution from the main module, freeing up Pam’s eight assignable outputs for more complex modulation tasks—think randomized triggers, Euclidean rhythms, or generative gate patterns. Collectors note that this separation of duties is what makes the combo so powerful: one module for creative sequencing, the other for reliable timekeeping.

Direct Expander Integration

The PEXP-1 doesn’t use a patch cable or MIDI interface—it connects directly to a rear-mounted expander header on Pamela’s NEW Workout. This ensures zero latency and eliminates ground loop issues that can plague daisy-chained clock setups. However, this also means only one expander can be used at a time. There’s no passthrough, so if you’re using a rear-mounted power cable or another expander like the PEXP-2 (which adds CV inputs), you’ll have to choose. The physical attachment is secure, but the combined depth—Pam’s 38mm plus the expander’s overhang—can be tight in shallow cases. Some users report needing to remove the expander temporarily to fit the module into a case with rear panels or power supplies close to the back.

Historical Context

When Pamela’s New Workout launched in 2015, it redefined what a clock module could do—offering generative sequencing, probability, and deep modulation routing in a compact format. But its lack of dedicated external sync outputs was a glaring omission for users trying to integrate it with non-modular gear. At the time, many relied on workarounds: using a general-purpose output assigned to MIDI, or patching through a separate MIDI-to-CV interface. ALM addressed this in 2017 with the PEXP-1, not by overhauling the original design, but by offering a surgical add-on. This modular philosophy—build core functionality, then expand via dedicated peripherals—was already common in the Eurorack world, but the PEXP-1 executed it with rare elegance. It arrived just as Eurorack was exploding in popularity, and as more musicians began blending modular systems with vintage and digital gear, the demand for reliable, multi-format sync became critical. Competitors like Intellijel’s UCV or Clockface offered all-in-one solutions, but the PEXP-1’s focused functionality and seamless integration gave it an edge among purists who valued timing accuracy over feature bloat.

Collectibility & Value

The PEXP-1 has never been discontinued, and ALM continues to manufacture it, so it’s readily available new from dealers for around $110–$115. On the used market, prices range from $80 to $100 depending on condition, with most units selling quickly due to high demand. Unlike some vintage modules, there are no known production variants or revisions—every unit is functionally identical. Failures are extremely rare, as the module contains no moving parts and minimal circuitry. However, the expander header connection can be a weak point: if the module is repeatedly removed and reinstalled, the pins on the host module (Pamela’s NEW Workout) can wear or bend. Documentation shows that ALM recommends securing the expander with the provided screw to prevent wobbling, which could damage the header over time. When buying used, it’s wise to verify that the expander fits snugly and that all outputs function—especially the DIN Sync, which relies on correct pin alignment. Because it’s dependent on the host module, the PEXP-1 is almost never sold standalone; most listings include it bundled with Pam, often at a slight premium. For collectors, a mint-condition PEXP-1 adds completeness to a Pamela’s setup, but it’s valued more for utility than rarity. Still, in a rack where timing is everything, its presence can be the difference between a chaotic patch and a perfectly locked groove.

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