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2XB303 Acid Bass Sequencer

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App History

update
Version 1.2
Jul 14, 2018
update
Version 1.1
Jul 05, 2018
fiber_new
New App: $4.99, v1.0
Jun 22, 2018

Other apps by Rob Wilmot

iTunes Description:

A creative bass music synth sequencer for electro melodies or dirty phat & funky acid techno basslines.
Look at the video tutorial for a how-to guide. Listen to what you can create easily with 2XB303.
With sequence manipulation features, effects, syncing & audio routing with Audiobus V3.
Inspired by the acid house music scene. An IOS exclusive, compared to a modern equivalent to Rebirth (Rebirth was a popular 303 clone a decade ago).
Create sequences using standard step functions as seen on various sequencers like the Roland SH-101 or use one - button generation. Easily capture whatever you hear and export easily AudioShare, Audio-Copy, Email or iTunes Shared Folder
Tweaking by familiar means: filter cut-off & decay Env-Mod & glide & accent etc for that classic sweet-spot acid growl Now with knob helper. Tap to enter this mode to swipe up & down for finer control of knobs.

The sound was first compared to a Cyclone TT-303 & tweaked to extend sound shaping beyond a just bass maker. Waves have optional harmonic version, noise, LFO, glide speed & PHAT/ BASS, effects levels to play with. This is designed to give more creativity beyond an acid bass maker.

This description be used as a quick guide
Controls are per channel except global/master effects (yellow ).

METRONOME: Toggle drum beats -better than tick-tocks to accompany your basslines
MEMORY: Next memory to load. If playing, it loads at the next loop else it will load immediately. Make sure you have saved your current sequence!

1-32 steps
OFFSET +1 / +31
COPY, PASTE & CLEAR sequence
RANDOMIZE all or just NOTES (auto selects notes if none chosen), SHUFFLE rearranges pattern, EXPAND repeats length to fill all 32 steps
PRESET loads pre-programmed sequences.
TRANSPOSE key changes pitch of both sequences for cool melodies.
SWING (global). Some step values like glide or rest are ignored when on

MOD:
LFO auto controls FILTER CUT-OFF and/or PITCH. The pitch level can give a vintage effect subtly detuning pitch with low LFO SPEED or faster for chaotic random pitches.

SOUND
Select WAVE from SAW, SAW + harmonics, SQUARE, SQUARE + harmonics & NOISE
DETUNE, TRANSPOSE & GLIDE speed.

MIXER
PAN, BASS cut/boost, MUTE 1, 2, "I" (INPUT) & METRONOME. Input = mic/Audiobus filter etc
PHAT= pre low-pass via high pass returned to low pass mix. A nice fresh modern sound. The PHAT cut-off & resonance is synced to the main filter & env mod.

EFFECTS
OVERDRIVE, COMPRESSION adjusts threshold, ratio, & gain. This is a global effect.
ECHO feedback & wetness. SPEED = tempo synced.
SAVE ALL. When not playing, save to memory.

SYNCING
Ableton Link syncs other apps or use without for precise timing. Press LINK button at the bottom for settings.
MIDI. External, virtual or Audiobus. You can sync with your favourite hardware using an interface or other apps. 2XB303 can be master or slave. ( any simple class-compliant USB should work but some may need to be power assisted)
Virtual MIDI Input is always on. If you send from another app AND receive MIDI clock then you will be receiving both MIDI CLOCKS. Choose only one unless you want double tempo (which can be interesting).
While Ableton Link is enabled you can send clock. This means you can use one app to control 2XB303 with external hardware

AUDIO
Record a fixed length, default to 32 steps. Can be changed in settings.
Arming the sampling with CAPTURE (flashing). Starts at counter 1 (ON).
PLAY CAP to hear sampled loop.
Audio can be routed using IAA into apps like Apple's Garageband. Garageband will also sync your sequence for excellent multi-track recording.
Audiobus 3. Route audio to mix or record into other apps
Audiobus Filter. Audiobus 3 V3 input will travel through channel 1 and then gated by sequencer. Mute Ch 1 to hear just audio input. Play vocal loops or guitar riffs with a synced filter & delay set in 2XB303

SYSTEM
BACK ENABLE: If disabled, will shut down background processes to preserve CPU.

What's new in v1.2

Improved contrast. Previously it was a bit "dull", especially in daylight.
Made knobs a bit more "knobby" and less "jumpy"
Added a knob helper for fine adjustments. Tap the knob and swipe up and down the screen for finer adjustment of the current knob.

iPad Screenshots:

iPhone Screenshots:

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