78

The CR-68 had already placed a microcomputer behind factory rhythms, fill timing and variation. The CR-78 uses that control system to cross a new boundary: two RAM devices retain four two-measure patterns when the machine is switched off. This is why the larger cabinet and higher price matter; the second member of the pair carries an authoring system, not simply more sounds.

The user does not receive an empty modern grid. Four instrument parts and accent can be entered in each memory, while the machine's presets, combinations, add voices, voice cancellation, rolling variations, manual fills and fades remain available around them. New and factory-authored rhythm therefore coexist on one panel.

Roland's contemporary advertising called this programmability an escape from waiting for a drummer named Louie. The joke is dated, but the premise is precise: a musician could now decide the rhythm before a session, retain it and reproduce it without asking the factory—or another player—to supply the pattern.

The preset bank occupies the lowest row because it is the quickest route into sound. White keys select older dance forms and basic pulses; green keys carry Latin-derived rhythms; blue and yellow keys bring rock and disco into the vocabulary; red keys cancel the active group. The A/B switch doubles selected labels without doubling the number of visible buttons.

Above that bank, four yellow programme memories create a second route through the instrument. The selector chooses one voice at a time, the MEMORY/PLAY control changes the panel from playback to writing, and CLEAR removes either the selected part or the whole stored rhythm. Four indicator lamps show which memory is active; they do not display the notes inside it.

The left-hand controls shape time at the level of the arrangement. Measure chooses how often an automatic variation arrives, while the adjacent selector chooses a fill, a break, an A-to-B change or rolling snare and high-bongo figures. The manual switch lets the player call the event rather than wait for the counter.

The right-hand controls shape what reaches the output. Cancel Voice removes broad instrument groups; Add Voice returns cymbal/high-hat, Metallic Beat, tambourine or guiro at independent levels; Balance tilts low percussion against high; the two fade switches make entrance and exit part of the performance rather than an edit made later.

The rear-panel pair marked HIGH IMP. and LOW IMP. provides alternative output matching rather than stereo. External clock accepts a compatible pulse train, and the combination trigger output can advance suitable connected equipment. The footswitch sockets move start, stop and variation away from the hands, which matters when the CR-78 is accompanying a keyboardist or another instrumentalist.

Select one of the four PROGRAM RHYTHM buttons, clear its previous contents, choose an instrument, and move the programme switch from PLAY to MEMORY. The ordinary TS-1 write switch enters hits against the running rhythm. Missing a strike does not merely make a quiet performance: it writes an empty position into the stored part.

The WS-1 gives a slower, more exact method. Its BEAT and REST pedals move through 8, 12, 24 or 48 divisions of the measure one position at a time. This explains the unusual two-measure, 96-count architecture: the finest setting provides 48 decisions per measure, while coarser divisions let the same memory describe simpler patterns quickly.

Build from the lowest-information layer upward: establish bass drum, add the backbeat, and use hi-hat or Metallic Beat to reveal subdivisions. Repeat the process for each of the four available instrument parts. Accent is entered as its own pattern information, so phrasing is stored rather than added globally after the fact.

Four memories work best as sections rather than a large library: a stripped verse, a denser chorus, a bridge and an ending. Automatic variation can insert a fill after 2, 4, 8, 12 or 16 measures; manual variation lets the player decide the boundary. Cancel Voice and the add-voice sliders reshape a preset without consuming a user memory.

Verify the result. Recall another rhythm, return to the written location and test it at several tempos. If it survives while mains power is on but disappears after shutdown, the failure is in retention—the rechargeable battery, charging path or RAM supply—not in the act of programming.

The rear panel extends the arrangement. The +15 V trigger output can advance suitable equipment and the external-clock input can make the CR-78 follow another source at 48 pulses per measure. Check the receiving manual first: a shared quarter-note idea is not enough to guarantee electrical compatibility.

Start at the instrument trigger line leaving the control section. A narrow pulse charges or switches part of the relevant voice circuit. For a resonant drum, that disturbance starts a damped oscillation; for a noise voice, it opens a short control envelope around an already running noise source.

The bass drum target is 62.5 Hz with a 100 ms decay. A trigger disturbs a tuned network, which rings and then loses energy; pitch establishes the apparent drum size and damping establishes its length. High and low bongos are tuned near 600 and 400 Hz, while the low conga sits near 208 Hz and is allowed a longer 150 ms tail.

Snare combines a pitched body near 340 Hz with a brief noisy attack and a designed decay of about 60 ms. Rim shot and claves are much shorter, brighter events—approximately 1.48 kHz/5 ms and 2.63 kHz/18 ms. These targets show how the machine preserves clarity: every voice is assigned its own frequency region and duration.

The cowbell is the beat between two oscillators near 800 and 555 Hz. Metallic Beat uses three far higher oscillators near 6.17, 5.62 and 4.08 kHz, deliberately avoiding a single stable pitch. Noise, filtering and envelopes create hi-hat, cymbal, maracas and tambourine textures; the result is electronic metal rather than a recording of metal.

Guiro uses two much lower pulse rates, around 125 and 77 Hz, to create alternating scrape-like movement. Its dedicated add-voice level means it can sit over a factory pattern independently. This is a useful reminder that the panel's named instruments are not all generated by one universal circuit copied at different pitches.

Accent changes the level of stored events through a shared control path before final mixing. Balance then tilts the combined output between low and high percussion groups. Cancel Voice suppresses selected bright parts during performance, while add-voice sliders introduce tambourine, guiro and Metallic Beat without rewriting the source rhythm.

On the bench, use the service table as a factory reference rather than a command to make every survivor identical. Prove the trigger before adjusting a voice; measure both frequency and decay; document the original trimmer positions; and change only what falls outside the documented operating target or causes a real fault.

Chris Stein’s account of “Heart of Glass” emphasises combination: two named Latin patterns create the grid. Mike Chapman’s recollection emphasises studio function: the rhythm machine and its trigger help hold electronic and live elements together. These are compatible views of the same process, one heard from the band and one from the producer’s chair.

“Enola Gay” demonstrates the authoring feature directly. Andy McCluskey recalls OMD buying the programmable CR-78 and building the distinctive rhythm themselves. It became the bed of the finished track—not a temporary click to be replaced—and shows why four small user memories represented a genuine new capability.

For “In the Air Tonight,” the CR-78 belonged first to the act of writing. Collins adapted a supplied rhythm into the hushed opening pulse, then preserved the contrast between that miniature electronic space and the enormous acoustic fill. The machine’s apparent weakness becomes the arrangement’s dramatic premise.

Daryl Hall’s account is more immediate: Rock 1 was running when the bass part and chords arrived. The useful historical point is not that the CR-78 wrote the song, but that a particular preset supplied friction and momentum at the exact moment composition began.

Together the records demonstrate combination, original programming, adaptation and provocation. None required the CR-78 to sound realistic. Each depended on the stability and identity of a rhythm that left enough space for musicians to make the rest of the record.

An original CR-78 is not only a source of tones. Its panel timing, variation controls, battery-backed memory, ageing components and physical switching all shape the experience. Restoration preserves that coupled system, including behaviours that a sample library cannot carry.

The TR-8S and TR-6S update translated CR-78 voices into ACB instruments inside a performance-oriented modern sequencer. The TR-1000 extends that idea by letting CR-78 models coexist with multiple synthesis and sampling methods. In both cases the old sound becomes one selectable generator inside a much larger rhythmic grammar.

The dedicated Roland Cloud version returns to the identity of the complete machine. It models the original response but exposes tuning, decay, pan and mixing per instrument, provides 16-step A/B patterns and expands storage to modern proportions. It is simultaneously preservation and revision.

These versions should not be collapsed into a claim that every CR-78 is now interchangeable. Original hardware, ACB firmware and software share a designed lineage, but their converters, control resolution, clocking, gain structure and physical interface remain different. The archive records those differences as part of the instrument’s continuing history.