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Roland D-50

 

 

 

roland d50
audio demo Country: Japan
Weight: 11 kg
Dimensions: 974 (w) x 332,5 (h) x 94 (d) mm
audio demo trend price : 250€
manual   service manual demo video comments
Roland D-50
Linear Synthesizer (1987)

 

The D50 is one of the greatest all-time sales along with Korg M1 and Yamaha DX7.

L.A synthesis: hybrid sampled PCM short waveforms and generated synthesis.

roland d50 logo
technical data

info KEYBOARD 61 velocity keys with aftertouch.

Main panel features a 2 x 40 lines display, 54 buttons, a data entry slider and a data card slot. On the left side there is a joystick lever for modulation.

Back panel terminal connectors:
- main out
- headphones out
- Midi interface
- 2 pedal expression assignable to tone mix/aftertouch/ modulation
- 2 pedalswitch inputs assignable to patch change / chase / portamento

 

 

edit TECH main core is a 8-bits CPU UPD78312 manages 16 voices polyphony based on LA synthesis - the relative DAC is a Burr-Brown model HP54HP.

D50 Linear Arithmetic
is not like a wavetable synthesizer as no harmonic spectrograms are involved in this synthesis, instead, L.A is based on very short attack PCM transients for limiting memory usage. Psychoacoustic facts demonstrate that the "attack" segment is the most important part for the sound identification by human ear.



main d50

LA synthesis WG Wave Generator is a mix of 2 syntheses:
- Digitally generated basic waveforms (sawtooth & square waves) a kind of primitive VA (1)
- PCM wavetable (2)

 



edit
STRUCTURE HIERARCHY the minimal part is the PARTIAL composed by 2 UPPER tones + 2 LOWER tones then 4 combined tones make a PATCH. TONE has value for relation between both partials and each partial is like an oscillator with various synthesis chain elements:


synth
->WG (voice) + TVF (filter) + TVA (amplitude)





wave WAVE GENERATOR
the WG system handles a 128 kb ROM (at IC29-30) PCM wavetable + a digital waveform generator.
- 47 Transient PCM acoustic
- 29 Transient PCM spectral loops
- 23 Transient PCM normal loops
- 2 digitally generated sawtooth and square wave


128 kb


wave ALGORITHMS the WG combines partial synthesis elements with a digital ring modulator in 7 possible signal pathways or algorithms:
(p= pcm sample / s= digitally generated wave)


Structure Partial 1 Partial 2 2 partials Combination diagram
1 S S mix partial 1-2 s1
2 S S mix partial 1 + Ring modulator s1
3 P S mix partial 1-2 s1
4 P S mix partial 1 + ring modulator s1
5 S P mix partial 1 + ring modulator s1
6 P P mix partial 1-2 s1
7 P P mix partial 1 + ring modulator s1

 

 

 

adsr PERFORMANCE parameter CHASE is a special delay mode between the tones with 3 directions modes:
- Upper -> Lower
- Upper -> Lower -> Lower
- Upper ->Lower -> Upper
PATCH can be played also with a legato with variable portamento time.
MIDI quite basic but full MIDI exclusives is implemented with full support of edit and data dump.


roland d50 tech

 

 

filter FILTER structure is based on the TVF time variant filter which is a digital 4-poles resonant lowpass filter.

cutoff

TECH filter has a restriction: TVF does not act on a PCM element later possible on V-synth D50 emulation.

 

 

lfo LFO 3 delayed modulators (shapes: saw, triangle, random and square) and 3 destinations:
- LFO to amplitude
- LFO to pulse width
- LFO to filter cutoff.

LFo

 

 


adsr ENVELOPE
2 main EGs:
- EG1 amplitude : 5 segments + 5 times
- EG2 filter : 5 segments + 5 times.
All partials have their own EG for both amplitude + filter, for a total of 4 TVF EGs and 4 TVA EGs.

 

 

filter EFFECTS 32 reverbs + 7 chorus modulations.
Effect can be balanced with dry / wet parameter to different tones in 3 modes:
mono tones with stereo reverb
- stereo tones with stereo reverb
- stereo Tones with reverb to upper or lower tone.
A simple serial -12 dB EQ with HIGH settings boost (250 Hz) or a LOW boost (63 Hz) + Q-emphasis.




repair MAINTENANCE the D-50 usually suffers from dead key contacts: get q-tips and cleaning solution to wash both contacts and strips and pay attention to remove also possible cotton debris. Aftertouch is more critical and may need more attention to fix the sensors.

lithium battery
battery replacement


rubber contactD50 common keys issues

repair d50 tutorial
D50 repair tutorial video

 

 

memory MEMORY:
- 64 RAM internal patches
- no ROM sounds
RAM is doubled if using cards m-256E or m-256D.
RAM system included a Cr-2032 lithium battery in holder.

roland d550 internal


 

memory D-50 RELATED MODELS:

roland d50 pg1000
pg1000
D-550 expander version with same characteristics

PG-1000 dedicated D50 programmer

VC-1 card is a D-50 emulation for V-synth and V-synth rack
     
d10

mt32

pg1000
D-10 another member of the LA family.

MT-32 consumer version of D-10 series

MEX EXPANSION board enhances D50 functions

 

 

memory EDITOR many computer-based softwares are available:
- D50 librarian (PC donationware) PIC
- Soundquest (MAC/PC $$)
- EMC D50 editor manager (Atari ST) PIC
- Roland D50 parameter editor (Commodore Amiga) PIC
- DR.T editor (Atari ST)
- Synth works (Atari ST) PIC
- D50 manager (Atari ST) PIC
- CTRLR (PC/MAC free) PIC
- D50v (VST editor) PIC


roland d50 editor



 

effet VST PLUGIN / SAMPLED VERSION there are some free and commercial samples set:

  name price demo
KR AUDIO KR AUDIO 200 MB free
SAMPLES
n/a



 

demo D50 / D550 AUDIO TEST DEMO

demo original Roland radio advertising
demo acid play
demo electro drama
demo filter aftertouch
demo too classic D50
demo rave sound
demo sweep space
demo bright richpad
demo space vector
demo aliased filter
demo soft bell
demo sweet bell :)

demo weird organ
demo revolution likejarre
demo solo funk
demo what's the name?
demo yes I am a Tb303
demo ambient
demo sunrise
demo ring modulator
demo bass square
demo circular sound
demo various electronic sound
demo "MAMA-Genesis" with sampled drum




video VIDEO SELECTION

Roland D-50 Sound Demo various d50 ambient patches Roland D-50 Synth Patches
Sound Demo ambient patches Synth Patches

 

 




Company: Roland
Model: D-50
Class: Synthesizer
Dates: 1987
Price: 300€
Synthesis: L.A digital
Polyphony: 16 voices
Algorithms: 7
Memory: 64 patches
Filter: digital low pass
LFO: 3
Demo: 24

manual
MANUAL

roland d50 service manual
SERVICE MANUAL

manual
DOWNLOAD D-50 FACTORY SET


manual
OS EPROM FIRMWARE DUMP

 

LFo


original scan
manual original Brochure

 

original scan
manual original Brochure

 

original scan
manual original Brochure

 

d50 case
manual original D50 case

 

original scan
manual Custom D50
by custom synth UK

 

roland d50 cat
manual
manualD50 cat

 

LFo

 

Roland D-50 for sale

roland d50 for sale
CHECK OUT EBAY OFFERS

 

 

LFo

 

 

 

 

 

os eprom Digital synthesizer lcd replacement
awardSPECIAL AWARDS:
solid
solid
Digital king Classic synth


comment


REVIEW "All-time digital machine with some analog character. Not easy to approach, but worth it!"."

manual manual
- great sound - awkward Sysex dump
- still cheap
- bulky

 

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all snapshots*, sounds, texts copyright Polynominal.com / Eric Pochesci
polynominal.com is not associated or affiliated with Roland in any manner.
*custom d50 found on the net , no author
* VC1 card by Roland corporation

roland d50 4.5 out of 5 based on 49 ratings. price €200