Pure Acid 4+

Bassline Synth & Drums (AUv3‪)‬

Dmitrij Pavlov

    • 4.9 • 129 Ratings
    • $14.99
    • Offers In-App Purchases



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!

You can use Pure Acid app as a ready-to-go realtime musical instrument (groove box) in your jam sessions together with Ableton Link to synchronize it with the rest of your music gear. Its bassline editing system and randomization options will be handy to create unique groovy basslines easily. Realtime master effects with XY-pad controls can add expression to your live performance. You can also use Pure Acid with AudioBus, AUM or other IAA-supporting apps to create complex and interesting sound setups.


• supports AUv3, Ableton Link, AudioBus, Inter-App Audio, Core Midi, Virtual Midi In/Out, Bluetooth Midi
• AudioBus state saving support
• 64-bit sound engine
• Midi Learn
• Export to midi file
• includes Multiple Output AUv3 plugin with 6 audio output busses

Bassline Section:

• 2 classic bassline waveforms: Saw and Pulse
• classic knobs: Tune, Cutoff, Resonance, Env Mod, Decay and Accent
• Distortion effect with amount, HPF and Boost knobs
• filter LFO with rate and depth knobs

Sequencer Section:

• up to 12 bassline patterns can be stored in one preset
• up to 32 steps per each bassline pattern
• patterns can be chained together to create more complex patterns
• pattern Tempo and Swing parameters
• Gate parameter, which allows you to adjust bass note lengths
• Pattern Editor allows you to copy, transpose patterns, shift notes left/right, insert or delete a note, variate (randomize all note properties expect pitch), shuffle (randomize notes order only), reverse and compose patterns using Bassline Composer function
• onscreen keyboard allows you to enter bassline notes in a comfortable way. You can also record basslines in realtime.

Drums Section:

• 16 independent drum parts
• 35 different classic drum sounds with ability to tune your own drum kit
• each drum part sound has its own parameters: Tune, Decay, Attack/Snap/Color, FX A send, FX B send, Boost, Pan, Level
• up to 12 drum patterns and 4 drum fill patterns per preset
• 16 steps per each drum pattern, with ability to add 16 "backbeat" steps between main steps (32 steps per drum pattern in total)
• patterns can be chained together to create more complex patterns
• Swing and Flam features
• Total Accent part with adjustable total accent value can give you ability to "highlight" specific steps in your drum pattern
• new: step conditions for drum steps

Mixer Section:

• 2 mixer channels: Bassline and Drums
• Drive effect for each channel
• 2 send effect pedals: FX A and FX B
• 14 send effect types
• send effect can be routed to either master output, MFX or another send effect (FX A -> FX B), which allows to chain several effects one after another
• MFX pedal with 22 effect types to choose from
• FX A and FX B send amount knobs for each mixer channel
• XY-pad on each effect pedal to control their parameters
• Master Limiter effect to prevent sound clipping

and more:

• Unlimited number of user presets
• 84 factory presets
• Audio export to wav file (16, 24 or 32 bit)
• Preset / Bank Share function
• Selectable UI color schemes with ability to adjust colors manually
• Can work either as a standalone app, or as AUv3 audio unit plugin
• Designed for both iPad and iPhone

What’s New

Version 1.5.4

- Fixed: Ableton Link was not working in the network between Ableton Live and Pure Acid on the newest iOS versions;
- AUv3: Midi In Channel settings bug fixed. Previously, audio units always had [Bass: Any, Drums: 10] Midi In channel setting. Now it corresponds to what you set in the standalone's global Midi In Channel settings (Settings menu);
- now you can Paste a bassline (or drums) pattern into a new pattern slot during playback right before jumping to that slot. It is helpful during live playback if you want to create several bassline (or drums) patterns by copying one to another without interrupting the playback. All you have to do is tap the destination pattern slot, and then quickly tap the Paste button right before the cursor jumps to that pattern slot.

Ratings and Reviews

4.9 out of 5
129 Ratings

129 Ratings

plaid_emu ,

The Ultimate Acid Trip

It’s all right here folks. No need to look any further if you want a premium dose of high quality acid app coding. I’ve tried a lot of emulations and also the real deal. This tops it all for the most fun and comprehensive all-in-one self contained experience.

The sound is full and warm with definition and detail. The sequencer is a real treat. The scale modes and variation/shuffle function is excellent. It plays well with other apps and I’m going to try and sequence my TD-3 with Pure Acid in the next day or so.

I can’t believe I didn’t know about this until a couple days ago. Better late to the party than never. My only minor and petty niggle is that you can’t change the custom colors for the main 303 knobs. If that’s the only gripe I have then this app is near perfect. I can’t keep it closed.

lightchazer84 ,

Great for Beginners and Veterans

I am a beginner in the iOS music production world. I really got frustrated with many apps, trying to make synths work with certain DAWs, trying to get something started and enjoy myself in the process.
This app delivers exactly what I want! It’s super intuitive and compact. So I find myself learning while I can actually have sort of a live jam session, or even program nice drum patterns with ease.
Now the sound of the Bass in this is App is a certain kind of sound from earlier Acid House Days, or maybe Chemical Brothers come to mind. But there are swing options which make for a whole different vibe if needed.
If you are a beginner, or if you are familiar with iOS music production, either way you should not miss out on this. Tons of fun!!


HORRIBLY crappy app logo and icon on an app that is otherwise generally likable

So f’ing tired of that retardly crappy app icon and logo. Would be SOOOOOOOOOOO easy for the software engineer making the app to remove that from the GUI and also easy these days to make an alternative icon option in the app prefs. (Suggest a normal smiley face without any “edginess” as most ravers (absolutely the main potential customers) aren’t “edgy” in that way unless they had family issues that need to be addressed through a healing process or need to go to rehab).

If the app maker foolishly believes an “edgy” icon will attract some “edgy” younger customers, he is SEVERELY naive and obviously hasn’t heard that mumble rap is the “edgy” music choice of the face tattooed “edgy” younger customers that prefer to pirate apps anyway. This app doesn’t make 808 bass melodies, so is also relatively useless for that genre.

App Privacy

The developer, Dmitrij Pavlov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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