ALM PEXP-1 (2017–Present)

A battered TR-808 and a Digitakt, both synced to a modular rack. This little expander is what makes that handshake work.

Overview

Pamela's New Workout is a well-known Eurorack module for sequencing and clocking. Out of the box it lacks one thing: dedicated external clock outputs. You can jury-rig a MIDI clock from a CV/gate output, but it's a compromise. The PEXP-1 fixes that. It plugs into the back of your Pam and adds MIDI Clock and DIN Sync outputs, plus four buffered gate outputs locked to fixed divisions of the master clock: x1, x2, x4, and /4. No menus, no setup, no drift.

There are no flashing lights and no complex patching. It sits in the back row and keeps everything else in time. Say you want to drive a Roland SH-101's arpeggiator via DIN Sync, send MIDI Clock to a Digitakt, and use the /4 output to trigger a sample on an Elektron box. It does all of that. It draws power directly from the expander header - 25mA at +12V, nothing from -12V or 5V - so it doesn't tax your power supply. It's only 4HP, but it takes up the expander spot on the back of your Pam. That means 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 vintage gear - Roland's 30-series synths, early drum machines, even Korg's SQ-1 or Volca line - without extra conversion modules. The MIDI output is equally solid, with no jitter or latency to throw off tempo-sensitive devices. The extra gate outputs are buffered, so they won't load down the internal clock signals. They are also fixed, so they always track the master clock regardless of what the sequencer is doing. That matters if you use 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 has 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, so it works with TB-303s, TR-606s, and SH-101s. The MIDI output transmits standard clock messages without start/stop filtering, so it works with modern grooveboxes and DAWs. Service technicians observe that the timing is derived directly from Pam's internal clock generator, so there's no jitter or timing drift, unlike some DIY solutions.

Four Buffered Fixed Gate Outputs

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). They are buffered, so 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 and frees up Pam's eight assignable outputs for more complex modulation tasks, like randomized triggers, Euclidean rhythms, or generative gate patterns. Collectors note that this split is what makes the combo work: 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. It 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 offered generative sequencing, probability, and deep modulation routing in a compact format. Its lack of dedicated external sync outputs was a glaring omission for users trying to integrate it with non-modular gear. 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 an add-on. Building core functionality and then expanding it with dedicated peripherals was already common in the Eurorack world. The PEXP-1 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 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. 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. The weak point is the expander header connection. 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, 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.

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