TECH main core is a RISC 32 bits (Reduced Instruction Set Computer HD6477034F20C) manages 64 voices polyphony or TONES, DAC is a 16/18 bits UPD63200GS-E2
a basic patch is composed by 4 tones or PCM samples with indipendent parameters:
delay start time
WAVETABLE is a 8 Mb ROM (2x IC at 25 + 26) 448 PCM at 44,1 kHz / 16-bits waves
The wave XP ROM is split into 2 main families:
- 193 PCM percussive and chromatic one-shot
255 PCM instruments
EXPANSION the XP-50 is expandable using SRJ-V board (usual size is 4 or 8 MB) fitted in 1 of the 4 available slots.
There are 21 SR-JV available with different instrument styles, here is the list:
||SUPER SOUND SET
||KEYBOARDS OF THE 60's & 70's
||BASS AND DRUM
||SPECIAL FX Collection
||EXPERIENCE promotional board.
||EXPERIENCE2 promotional board.
ALGORITHMS the tones can be combined in 10 structures partially inspired from classic synthesizer Roland D50.
||click on pic for structure list.
These are pre-fixed audio patch that connects the 2 pair of tones into variable setups mixed with audio elements such as amplifier / filter and 2 digital processes:
- Booster amplifies the signal causing a distortion with new harmonics 18 levels of effectiveness
- Ring modulator.
PERFORMANCE the XP engine manages up 16 parts each with assignable:
Midi channel assign
TIP: A special GM (General MIDI) bank reads SMF Midi ensuring a total compatibility.
FILTER the TVF Time-Variant Filter offers 4 modes:
peaking: PKG emphasizes frequencies around the cutoff value.
In addition a filter keytrack function with
+/- 200% harmonic content cutoff over octaves-
LFO there are 2 delayed and syncalble modulators, they do provide 7 shapes (triangle, sinewave, sawtooth, trapezoidal, 2 random modes and sample-hold) with adjustable symmetry.
ENVELOPE each TONE features 3 EGs:
- EG amplitude: 4 segments + 3 times, 8 velocity curves + key follows option
- EG filter : 4 segments + 4 times
- EG pitch 4 segments + 4 times, keyfollow + random pitch
EFFECTS the DSP is split in 3 sections:
- EFX: 40 inserts algorithms including distortion, overdrive, phaser, EQ, Leslie, tremolo, flanger, delay, and pitch-shifter.
- reverb: 7 classic algorithms (Hall, Room, delay, stage) with adjustable damp time
- chorus: digital chorus with variable rate, pre-delay, feedback and depth.
SEQUENCER quite similar to hardware MC-50 MkII, the xp50 manages up to 16 tracks at 96 clocks resolution per quarter note. Standard functions such as Overdub, Punch In-Out , Loop Parts, Quantizes and Copy-Paste.
TIP: Internal tool load function imports old format from MRC sequencers such as MC-500/ 300/ 50/ 50mkII and Midi files in format SMF 0 or 1.
640 ROM patches (including GS MIDI kit)
- 96 ROM performances
128 RAM performances
- 32 RAM performances
- 100 patterns
- 20.000 notes
- 99 measures
STORAGE whole data memory can be saved to built-in 3.5" Disk drive Teac FD-235HF to either 720 Kb or 1.44 Mb density
TIP: It is also possible to store SONGS made by sequencer for a maximum of 99 Songs (or 180.000 notes) on a single 1.44 Mb.
MAINTENANCE there are 2 common issues:
LCD is well-known to have some technical troubles as the display writings disappear from the display, and this problem just get worst after a while! generally the nearby capacitors could have leaked and need replacement. There is a TUTORIAL about this, but I did personally replaced capacitors and it worked.
- BUTTONS another frequent issues are contacts on the mainboard, tact switches need to be replaced soon or later as they get hard to push.
EDITORS some computer-based patch softwares:
Soundquest (MAC/PC $$)
JV-1080 editor (MAX MSP beta)
Changeit (old PC OS free)
VST PLUGIN / SAMPLED VERSION there are some free and commercial samples set:
Should be a free release but I cannot figure this out. Surely NOT approved by Roland anyway, so it cannot be legally sold.
*kindly sent by Federico Pasiecznik
have you some nice XP50 demos you want to share in this page? Upload'em!