Hilda Synthesizer 4+

Complex Oscillator Synth

Bram Bos

    • $12.99



Hilda is a Complex Oscillator Monosynth, inspired by the most interesting aspects of both west-coast and east-coast synthesis techniques. You'll find a wave folder, lowpass gate, and audio-rate modulations, but also a 12-mode filter and traditional VCA circuit. All parts of the instrument are carefully circuit-modelled to sound as analog (or digital, where applicable) as possible. It's like a best-of-all-worlds semi modular synth, but without the patch cables.

The unique mix of different synthesis components adds up to a unique sounding electronic instrument, which can be used as a playable synthesizer, a MIDI sequencer and an audio effect for external audio - or any combination of those three.

- Full Audio Unit compatibility (AUv3 instrument, audio effect and MIDI processor modes supported)
- Universal design (iPhone and iPad; iPad Air 2 or higher recommended)
- Built-in analog style 16 Step MIDI Sequencer with custom scales
- 12 mode filter, based on the Oberheim Xpander design
- Drone mode lets you [partially] bypass the VCA/LPG and just go with the flow
- DIY Lo-Fi digital delay circuit emulation
- Live pads with effects that can be triggered via the UI (or via exposed AU Parameters)
- All synth settings exposed a AU Parameters (for automation and MIDI learning in your host of choice)
- MIDI Processor plugin mode disables synth to save CPU
- Carefully handcrafted by yours truly, to capture the essence of my love for tinkering and experimenting with sound :-)

Find the user manual on ruismaker.com

What’s New

Version 1.2.2

- rotation (left and right) in the sequencer
- removed phantom-slide at large pitch jumps when glide is set to 0

Ratings and Reviews

4.9 out of 5
44 Ratings

44 Ratings

Guycoolio ,

Portable O-Coast Type Synth

Very fun synth/effect app that has a feel similar to Make Noise’s O-Coast hardware synth. It has a nice mix of Moog and Buchla character and with the sequencer or drone mode you can easily lose an hour just fiddling. Delay reverb effect is old school and gives the app even more of a hardware feel. It plays nice with other music apps also. Another hit for this consistent developer! Thanks!

Eriptron ,

Unplayable on iPhone 12/Now Presets broke!

Update broke presets. Deleted/reloaded app. No change. Can no longer access presets on my iPhone 12. What lousy test. Really sad. //\\ And that’s the last straw. Universal app my tooshie. I have not bought an Apple app in months because of continued decay of quality and this is the last one. It won’t play in the background using it as a Universal App. Seriously? It won’t save state even upon exit. The developer zoomed in for the iPhone photos, that’s deceptive. The pamphlet is NOT a manual. This is pathetic and it’s taken as good quality. Well for the iPhone 12 it’s a joke and the end of Apple App purchases. It’s just a waste of money. Goodbye. Deleted app. Happy Trails.

Developer Response ,

You can scroll the UI to access the presets. Obviously, the bigger the screen the better the experience. I can’t magically make your iPhone bigger. You can contact me via email if you want help sorting out the issues you’re running into.

@thekrazywabbit ,

Excellent App

Update: latest firmware addressed the issue below. Upgraded to five stars. Excellent dev and experience. Job well done!!

Fantastic app outside of one issue. Every time you load the app, you have to turn down the LPF, otherwise there’s a slight audible noise. No other app to my knowledge does this.

Developer Response ,

Hey there, what you're hearing is the Delay circuit. It's an emulation of a rather noisy delay chip (the PT2399, popular in lo-fi effect pedals), hence the noise you're hearing. In the next update I'll change the init-patch to be completely dry.

App Privacy

The developer, Bram Bos, 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


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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