Release QUADRO 1.7 · matttallison/quadro-fm1

1.7

Blank templates, programs 101-105: INIT, INIT BASS, INIT STRINGS, INIT LEAD and INIT ALL (every section on, flat and dry).
Five near-duplicate programs removed: ELEC BASS (FUNK BASS is the same sound); PHASE STR and NEW WAVE ST (PHASED STR and STRINGS cover them), HOUSE ORGAN (JAZZ ORGAN and ORGAN+BASS cover it). 105 programs in all.
Programs after the removed ones move down a number, so a program you saved keeps its slot but the factory program there is different. Check your saved ones.
Both demo songs now pick programs by name, and were re-rendered.

Phaser MOD ADD page: S&H and ENV can stack on top of the chosen sweep source, as on the original.
INTERVAL WRITE (SETUP > TOOLS, knob 4): play two keys and their distance becomes VCO 2's interval (range now +-60 semitones, 10 octaves).
FLAT footswitch: MIDI CC 68 lowers the lead a semitone while held.
HOLD footswitch: MIDI CC 69 locks the lead gate open after the key is released (pitch follows new keys).
TRILL WRITE: SETUP > TOOLS, knob 4 turned left; play one key, its distance from the lowest key is the trill interval.
Poly keeps to 3 octaves above the bass split, with no overlap.
TOUCH > BEND now bends up to one semitone (was two); the MIDI pitch wheel is unchanged at +-2.
Vibrato is half as deep in every program (full depth is now half a semitone, as on the original), and TOUCH defaults to OFF for new sounds; programs that set it keep it.
PHASED STR: a slower, shallower phaser sweep with less resonance (it wobbled).
Analog drift was centred wrongly (it pushed every oscillator sharp by about 40 cents); now it wanders around the true pitch.

The ARP Quadra's own sixteen factory voices, read from the patch sheets in its owner's manual: programs 1-16, with the rest following. (If you saved programs, they stay in the slots they were in, so the factory program there is a different one now: check your saved ones.)
MIDI in: velocity sets each section's level and the bass, poly and lead cutoff (GLO > VELOCITY, VEL FILTER); the scale lock and transpose can apply to MIDI keys (SCALE page, MIDI); CC 71-74, 91, 93, 94 and 20-23 are mapped; SETUP page 3 gives each section its own MIDI channel.
Sequencer: LATCH, RANGE up to 4 octaves, and an ACCENT or TIE for each of the 16 steps.
Lead UNISON (FILTER page): two detuned copies of VCO 1.
SETUP > TOOLS: TAP tempo, COMPARE (the stored program against your edit) and a RANDOM sound.
Flash: a store part that is full keeps the programs that fit instead of overrunning.
ANALOG DRIFT: each oscillator's pitch wanders a few cents over a second or two, as the original's free-running VCOs did (GLO > ANALOG, DRIFT; 0 is off).

Master effects on the whole mix: DRIVE, BASS and TREBLE shelves, a stereo CHORUS, stereo WIDTH and a compressor (GLO pages).
The room extended: reverb DECAY, DAMP, SIZE (room to cathedral) and PRE-DELAY; delay FEEDBACK, TONE, PINGPONG or STEREO mode, and four more note values (dotted 1/8 and 1/16, 4T, 32T).
Scale lock: set the keyboard to a KEY and SCALE (SEL > SCALE), plus TRANSPOSE.
Fixed: a section added to a program that had it off would not sound. Turning a footage on now brings its level up, and raising a level from zero turns its first footage on. The 16' footages count for a section being on.
Program INIT: a plain starting point for a new sound.

Six new sequencer modes: PEDAL, THUMB, CONV, DIVRG, PLAYED (the order the keys went down) and SKIP.
Fourteen new chords, 24 in all: ADD9, MIN6, MAJ6, DIM, AUG, SUS2, 7SUS, DOM9, MAJ9, MIN11, M7B5, OCT, 4THS, M7#11. Chords can have five notes.
4 new programs.
A second demo song (app/docs/quadro-demo2.mp3 and .mid) touring the new sounds. BP WAH and WIND NOISE are louder.

A step sequencer: SEQ = STEP plays a 16-step pattern (semitones from the lowest lead key, or REST) with LENGTH, GATE and SWING. GATE works in every sequencer mode. Press ARP to step through its pages; the screen draws the pattern.
4 new programs.
The factory programs rechecked for loudness: the poly is about 6 dB louder, and the quiet programs (pads, plucks, wah) were brought up to match the rest.
Key velocity out over MIDI is flatter (72-127), and TOUCH needs a firmer press at every sensitivity.

Sound design from scratch.

Waveform choice (SAW, SQR, PULSE, TRI, SINE) for the bass, strings, poly and both lead oscillators, with pulse width and PWM.
Filter types LP24, LP12, BP and HP, with drive and key tracking, on the bass, poly and lead.
Lead: oscillator sync, sub-oscillator and noise. Poly: detune and vibrato. Strings and poly: true 16' / 8' / 4' footages.
LFO shapes SINE, TRI, SAW, SQR and S&H, routable to the bass and poly filters.
12 new programs (see app/docs/PRESETS.md).
Fixes: 8' is now at the key's own pitch (strings and poly sound an octave lower than in 1.0); the lead's DET is in real cents (1.0's was about ten times too wide).
Programs are stored in a new format across more flash. Programs saved with 1.0 are not carried over; SETUP settings are.
Package identity FM-1_52.

A package identity of QUADRO's own, FM-1_52 (1.0's FM-1_96 is the start of other firmwares').
The sequencer louder: the lead's steps as loud as a held lead; BERLIN SEQ and SEQUENCE fuller, the sequence programs' steps longer.
A demo song: app/docs/quadro-demo.mid to play into QUADRO, and how it sounds (app/docs/quadro-demo.mp3).