Roland D-20

Multi Timbral Linear synthesizer (1988)

It's basically a roland D10 with internal sequencer and disk drive storage


OVERVIEW 61 key (velocity sensitive) with LCD display, a card slot for RAM (no waveforms expansion).
Simple pitch bender modulation on the left and a 3.5" disk drive.

- Roland D110 is the rackmount version
- Roland D10 same but without sequencer and floppy disk storage
- Roland D5 simpler version with no effects/sequencer/disk
- Roland PG-10 Programmer for quick edit

Terminal connectors:
- Midi Interface (no Thru port)
- main signal out
- headphones out
- power switch
- memory card slot
- Punch IN out pedal input
- pedal switch control for start stop and sustain


OSCILLATORS  intel 16 bits CPU 8097BH manages 32 voices (DAC PCM54 BB) polyphony or partial (a patch is composed by up to 4 partial); each partial being either a synth waveform (saw tooth or square with variable width) or any one of the internal 256 PCM samples. Finally Each pair of partials (1&2 and 3&4) an be assigned a Structure (13 models, see below).

PCM The sample PCM are divided into two banks, each with 128 samples.
PCM A: transient attacks (The attack samples concentrate on providing the attack envelope segments of behavior of instruments. )
PCM B:  same as A but in looped form. 
NOTE: 63 samples are dedicated to drums and percussion

SOUND HIERARCHY very confusing... typical of 90 roland. 
"The D-10 can produce a maximum of 32 voices using 32 Partials at the same time, A partial is the smallest unit of sound within the. D-10. A Tone consists of one to four Partials. A Tone made of only  one Partial can be played 32 voice polyphonically, but a Tone Of two  
Partials has 16 voices, and a Tone of four Partials is 8 voice polyphonic. Finally Multi Timbrals".... allll righhhttt


The partial combines partial synthesis elements with a digital ring modulator in 7 possible pathways or algorithms: (p= pcm sample / s= digitally generated wave).
Compared to D50, the D10 adds 6 more structures, 5 with ringmods + 2 with linear partials (sample / awve)

EFFECTS eight onboard digital effects: small and medium rooms, medium and large halls, plate, and three delays. Additionally you can set reverb/delay time and effect level.

LFO single triangle-shapped modulator , very simple compared to bigger D50.

ENVELOPE 3 main groups for pitch, amplitude and filter with very similar specs: 5 times+ 4 times.

FILTER: digital resonant lowpass for SYNTH part (not pcm) like D50 

Drum, sequencer, memory

DRUMS The built—in rhythm machine stores 32 different preset rhythm patterns + another 32 user programmable patterns.
 You can make  a song (or tune) in a rhythm track by using those rhythm patterns. Also an internal metronome  

SEQUENCER  offers nine tracks and an store approximately 16,000 notes- The maximum length of a sequence is 500 bars, 
Tracks 1-7 an play a single Tone, track eight an be either a synth or a rhythm track, while track nine is a dedicated rhythm track

MEMORY  Preset Patches: 128  +  User Patches: 64. 
Sounds can be saved to Midi sysex dump or to memory card (models: M256 , M512e, M128)

STORAGE DISK: 3.5" DSDD floppies and can store approximately 35,000 notes. There are four file types: Song, Sound, Rhythm and All (full memory) can be replace with more modern usb gotek.

Roland D20 Specifications

Year Released: 1988
Model: d20
Country: Japan
Original price: $1395

Synthesizer Section
Keyboard: 61-key, velocity sensitive
Maximum Polyphony: 32 voices
Number of Multitimbral Parts: 8
Memory Capacity Timbres: Internal 128 (editable)
Memory Capacity Patches: Internal 128 (editable)
Memory Capacity Rhythm Sets: Internal 32, User 32
System Common Effects: Reverb (8 types)
EFX: 13
Sequencer Section
Data Storage: 3.5" Micro Floppy Disk (MF-2DD)
Data Format: standard Roland D-20 format
Tracks: 8 Tracks
Internal Memory: 16,000 notes
External MFD: 35,000 notes (Song Data)
Max. Length of Song: 500 measures
Display: 16 characters x 2 lines backlit LCD
Connectors: Output (L(Mono)/R), Hold, Start/Stop, Phones,
Punch in/out, MIDI IN / OUT / THRU
Dimensions: 1014(W) x 301(D) x 106(H) mm (40" x 12" x 4")
Weight: 10.1kg (22 lbs 4 oz)

D20 needs often overhaul for key and contact switch.

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