Hey, I'm Fred developer of FAC

We share the same passion: MUSIC. A wonderful universal language and an amazing source of happiness.

FAC is a one person business, and as you may guess designing such apps is a very long process.



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DRUMKIT Fred Anton Corvest

Drum Synth And Sample Player

Download on the App Store
  • 16 Voices Drum Synthesizer and Stereo Sample Player (1 Synth/Sampler per voice)
  • 2 oscillators (16 Waveforms) per voice with filters and phase modulation
  • 1 sample player per voice with sample position, filters, phase and stereo control
  • Drag and Drop File Support and mutli sample loading NEW 1.2
  • Advanced Pitch and Amp envelopes with multi control points and delay
  • Envelope templates, modifiers and copy/paste
  • Mixer page: 16 voices (Multi Output)
  • Drum PAD page: voices triggered by drum pad (MIDI OUT and Velocity Sensitive)
  • Includes classic drum machines built in presets for inspiration
  • iOS AuV3 - Multi Output (If Supported By HOST) - Universal (iPad/iPhone)
  • Leave a ★★★★★ review on the
  • App Store

Main features

Everyone agrees that the drums are a very important key element of almost every genre out there, they are the fondation of a song. We are all fan of acoustic drums and drum machines, they each have different characters and strengths. FAC Drumkit combines both world, samples and synthesis, in order to provide new exciting and unique sounds. As a rule of thumb, the synthesizer section brings the body of the sound, and the sampler the unique character. Both parts are layered together and contain essential parameters to ensure they won't clash and will sit well together.

On top of the samples and synthesizer section, FAC Drumkit brings unique Amp and Pitch envelopes with precise control points to modify the curve in a gentle or extreme way. The envelopes play a very important part in the signal path because, thanks to their flexibility, they allow designing very special transition. Indeed, the envelope of a Clap is probably the best one to illustrate the benefit of such envelopes created by points. The burst kind of sound is very hard to replicate with classic ADSR, it's not the case in FAC Drumkit. Needless to say, thanks to the control points the pitch transitions are also more interesting and precise. The value of each control point can also be altered manually, to set the root note of a kick for example.

FAC Drumkit is for everyone, as sound designer you will be able to synthesize your own drums in a fun and creative way. On the other hand, if you are looking for instant results, use the provided presets or load your favourite sample pack in the sample section of the 16 voices.

The app comes with three pages, the voice editor, the mixer and the drum pads.

Page 1: Voice editor

① Stereo Sampler
  • Sample button user/factory samples manager (tap/long press)
  • Main Button activates the sampler
  • HPF Cutoff/Q high pass filter cutoff and Q
  • LPF Cutoff/Q low pass filter cutoff and Q
  • Phase phase inverter
  • Level sampler level

⑧ Envelope Additional Parameters

  • Width defines the width of the stereo image
  • Start the start position of the sample
② Synthesizer (OSC 1/2)
  • Main Button activates the synthesizer
  • Phase Mod Button activates the phase modulation between oscs
  • Waveforms Osc 1 & 2 16 waveforms + white noize (Osc 2 Only)
  • HPF Cutoff high pass filter cutoff
  • Pitch Ratio of Osc 2 ratio applied on the pitch env for osc 2
  • LPF Cutoff/Q low pass filter cutoff and Q
  • Levels Osc 1 & 2 level of osc 1 and 2
③ Voice
  • Level of the voice
  • PAN stereo position of the voice
④ Voice Selector and options
  • 16 buttons to set the voice you want to edit
    • Tap to show the menu: copy/paste, set the instrument category label or reset the voice
    • Long press and hold to re-order the voices
    • Each button accepts drag and drop gesture from Files (files only)
⑤ Preview Button
  • Single button to monitor the sound you are designing
⑥ Osc and ⑦ Sample Envelopes Sections

Tap the section buttons to select the envelope

Tap again to show the templates, those are starting points for designing new sounds

  • Button 1 OSC 1/2 Pitch Env
  • Button 2 OSC 1 Amp Env
  • Button 3 OSC 2 Amp Env
  • Button 4 Sampler Pitch Env
  • Button 5 Sampler Amp Env
⑧ Envelopes Options

The contextual options are dependent on the current section (⑥ or ⑦) and the position of the points

  • Delay shift the envelope on the time axis (first point)
  • Edit input dialog to set the value (current point)
  • Add/Del long touch to add a point or remove the current point

  • Env provides Copy/Paste and env alteration facilities
  • Wide is the zoom mode. Wide or Lens (precise view of the attack)
⑨ Page Selector (Always Visible)
  • Button 1 Voice Page
  • Button 2 Mixer Page
  • Button 3 Pad Page, tap the button to get a menu where you can activate the velocity for the pads
⑩ Preset button (Always Visible)

Preset manager (tap/long press)

Page 2: Mixer

16 Channel Strips (From top to bottom)
  • Multi Out Toggle the button to add/remove the voice to/from the main output
  • Level of the voice. Long touch to set all the levels in one operation
  • PAN stereo position of the voice
  • MUTE the voice
  • SOLO the voice

Page 3: Drums Pads

16 velocity sensitive drum pads
  • The drum pads send MIDI out and supports velocity mapping from bottom to top. Or from low to high
  • To avoid any MIDI loop, it's possible to bypass the internal triggering. Tap the button page to show the options
  • Long press and hold the pads to re-order the voices

💡 Multiple Outputs support

Multiple output is available by default (1 voice means 1 additional output). In the mixer view your can add or remove voices to/from the main output. Grouping outputs is a host features. Warning: you need an AU host supporting multiple outputs (Cubasis, Dramboo, ApeMatrix, AUM).

💡 Loading user samples

You can load a total of 16 users samples, one sample (max 1sec) per voice. The users sample files are not copied, FAC Drumkit uses and keeps secured bookmarks. Long press (hold) on the Sample button to get the menu:

⇨ Load factory into the current voice
⇨ Load an user file or folder into the current voice
⇨ Load multiple user files or folders in one take (one file/folder per voice)

In addition you can also drag and drop audio sample files from Files. FAC Drumkit is not a super sampler and it's focused on drums (transient one). The 1 sec duration applies for samples and envelopes.

💡 Parameters MIDI CC Automation

The following list of parameters can be altered by external sources set in AUM (for all the voices): oscs hpf/lpf(+q), osc2 pitch ratio, sampler hpf/q /lpf/q and voice level. Warning: some hosts are forcing the listing of all parameters! The one not mentioned in the previous list are not supported.

💡 Always check your audio levels

In general, use the gain in parsimony, to avoid any excessive levels that may damage your ears or your system. FAC Drumkit shall not be liable for any loss or damage of whatever nature (direct, indirect, consequential, or other) to your material (software, hardware, or other).

Good practice: As soon as you add FAC Drumkit to a track, set the level around -6dB to -10dB to prevent overloading.

💡 Import/Export of User presets (Stand-alone App)

Both the import and export folders are processed by the stand-alone app every time you launch it. The export folder contains a backup of all presets (factory and user), the import folder contains the user presets you want to import. Both folders are located in Files in the application folder. Read carefully the Readme file.

Important Copyright and Licensing Notice: The user sample files bookmarked in FAC Drumkit by the customer are copied in a single export folder (Stand-alone App only) for the purpose of facilitating the backup of the data AND to share the user preset as long as the customer is the rightful owner, or the owner of redistribution rights, of the samples used.

As with all FAC products, the interface has a unique sober look and provides a great user experience. The value of each knob can be monitored at any time. The knobs are very responsive, natural and follow a specific curve according to the parameter type.

Preset Management and note about the default factory

FAC Drumkit comes with factory presets to provide you a source of inspiration for your sound design adventure. The provided presets try to mimic some of the famous sounds you may find on classic drum machines. You will notice that the sample section (from the default factory) is often simple, mainly noises. This is done on purpose to show how easy it is to get interesting sounds with minimal elements. I enjoyed designing the factory presets because it was so rewarding to understand how different parts of the signal path interact to produce some famous sounds we all know very well.

The preset button provides common management features: loading, organization and saving. The left and right arrows allow fast navigation shortcuts among all the presets (factory + user), a short press on the center label provides a detailed list of all the available presets, select the one you want to work with. On the other hand a long press (hold) provides contextual operation. For factory presets it's possible to save the current preset to a user preset, for user presets it's possible to rename, save and delete the current preset.

FAC Drumkit --- Official Promo VideoOfficial Promo Video FAC Drumkit --- Kick Tuning (Pitch envelope & Sampler)Kick Tuning (Pitch envelope & Sampler) FAC Drumkit --- Sound design of a ClapSound design of a Clap The Sound Test Room --- Pre-Release Tutorial & Demo for the iPadThe Sound Test Room - Pre-Release Tutorial & Demo for the iPad Jamie Mallender --- Build Your Perfect Drum Kit in FAC DrumkitJamie Mallender - Build Your Perfect Drum Kit in FAC Drumkit haQ attaQ - FAC Drumkit is Fantastic and Works like this!haQ attaQ - FAC Drumkit is Fantastic and Works like this!

FAC Drumkit - Cubasis Pads

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Check out what musicians think about FAC Drumkit

Just recently got FAC Drumkit and I’m totally in love with it. What an amazing app

Poppa Docrock

Blown away already, after just a little play. No fluff, just superb functionality in a beautifully formed interface


Man, those sounds have so much dynamics! This must be the best sounding drum synth on iOS


This thing is perfect! FAC you did it again!


It sounds good. Really really good. Impressed and chuffed


I have to repeat this sounds awesome as all FAC apps. Thickest kicks yet on ipad for me

Ehehehe ABF

Download on the App Store