Roland D-20

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.

RELATED MODELS:
- 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

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

Others
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)

Roland D-20

Multi Timbral Linear synthesizer (1988)

Overview

Sound

Algorithms

Drum, sequencer, memory

Roland D20 Specifications