App store description: Pure Acid is a top quality bassline synthesizer and drum machine in one app! Inspired by classic hardware bassline synthesizers and rhythm machines, which changed musical world back in 80's, like the legendary TB-303 synthesizer, TR-808 / 707 / 909 rhythm boxes and their numerous replicas, Pure Acid is designed to bring back the feeling of retro analog gear in every detail in terms of sound, as well as to provide new functions previously unavailable in the original devices to make your music creation workflow fast and fun! A large number of factory preset patterns will immerse you into an exciting world of Acid House, Techno, Hardcore and Big Beat music genres, which will inspire you to create your own basslines and rhythms for your compositions!

App type: App and AUv3

App store link:

Developer: Dmitrij Pavlov (Jim Pavloff)

Developer AB Forum Handle: @jimpavloff

Jim Pavloff advises : “holding down the Step Edit button in the Drums section, you will be able to edit additional 16 steps (backbeats)? Backbeats are steps which shifted forward by a half step between the main 16 steps.”

@lorichs also mentions : “Another one on the drum machine. Go into step mode. Hold down the desired step. Now spin the dial to the left to set up step conditions.”

Most controls in the app can be controlled via MIDI. Pure Acid has MIDI Learn capability to override the default mappings.

• 7 = Master Vol
• 8 = Bass Vol
• 9 = Drum Vol
• 12 = Env Mod

• 16 = Accent
• 17 = Distortion
• 18 = Drive Bass
• 19 = Drive Drums

• 91 = Bass Send FX A (?)
• 92 = Bass Send FX B
• 93 = Drums Send FX A
• 94 = Drums Send FX B

• 71 = Resonance
• 74 = Cutoff
• 75 = Decay
• 76 = LFO Rate
• 77 = LFO Depth

• 85 = FX A Param
• 86 = FX A Param 2
• 87 = FX A Param 3
• 88 = FX B Param 1
• 89 = FX B Param 2
• 90 = FX B Param 3

• 102 = MFX X
• 103 = MFX Y
• 106 = MFX ON/OFF

• 104 = Pitch

Pattern-changing via MIDI. The bass synthesizer and drums accept MIDI program change 0 through 11 to select patterns 1 through 12. Send program change on MIDI channel 1 for bass patterns and MIDI channel 10 for drum patterns. The change happens when the current pattern completes which is just like the buttons.