Melthaven by quantovox (Released)

Pixel

https://apps.apple.com/app/id6761633340

Melthaven is a note-triggered phase shifter built to give guitarists and bassists organic, rhythmic movement that syncs to their playing, rather than a fixed LFO. It's also highly suited for a number of synth basses and sounds with sharp attacks and fast decays.
Its analog-modeled OTA filters provide deep resonance and character, ranging from wah-like effects to complex, shifting formant textures or even experimental tones, like bubbling or hard, slappy effects. For bright, harmonically dense signals – such as saturated or overdriven tones and synthetic sounds – the effect range also includes growls and glistening sweeps.

FOCUSED ON BASS & GUITARS
The effect was specially developed to respond to the frequency response and transient peaks of electric guitars and basses. Every pluck, pop, or pick attack re-triggers the phase sweep, effectively turning your rhythmic timing into the "engine" of the effect.

FOR SYNTHS & SOUND DESIGN: INPUT DEPENDENT
Because Melthaven relies on clear transients, results will vary based on your source material. On signals with softened transients – such as pads or sounds undergoing heavy effects processing / layering – the effect can produce wild, unpredictable, and experimental responses. The dedicated smoothing feature can tame these re-triggers, yielding a flow that can feel organic and physical in its instability when operating beyond the plugin’s transient-focused comfort zone.

MOVING BEYOND ENVELOPE FILTERS
The plugin uses low-latency note detection paired with its own envelope generator and LFO, allowing sculpting and even reshaping each note’s modulation profile or filter envelope. It even detects notes that hide under a consistent signal amplitude when using a traditional envelope follower.

BASE FEATURES:

• Built around a versatile preset from the Pro version to suit a wide variety of applications
• Controls: feedback & panoramic position, attack & hold timings, LFO Rate
• Smoothing: from envelope shaping to creating a weighted, fluid response, giving note sequences a sense of physical momentum
• Low-latency engine: preserves natural playing feel when used as a real-time effect

PRO FEATURES - Requires Pro Edition Upgrade (In‑App Purchase):

• Additional envelope parameters, several envelope flavors with pre-mapped control subsets
• Pro presets encompassing both strong and milder effects, including the quintessential rubber bass
• Enhanced stereo phaser modes & internal stereo re-imaging modulator (for formant-like effects and more)
• Vintage-style phaser feedback that can optionally build or ramp with each note onset (non-rampable in the base version)
• Instant visual feedback via an audio scope with dual-channel envelopes overlaid on the input waveform

TECHNICAL NOTES:

• Place before creative effects (unless experimenting). It can be used before or after harmonic processing (saturation, amp sims) depending on your preference
• Response may vary on sustained notes with shifting harmonic content
• Not optimized for upright bass due to its reliance on sharp signal transients
• Note detection involves statistical signal processing and confidence intervals. Weak transients and phantom notes could lead to a loss of output determinism, i.e. sensitivity to changes in certain project settings
• While it offers multiple layers of real-time control, Melthaven operates primarily as an automatic effect; for full manual filter manipulation, please refer to RealPhase, a separate app

PLEASE NOTE:
• The Pro Edition Upgrade is offered as a one‑time In‑App Purchase
• An AUv3-compatible host is required to use this app
• Suported sampling rates: 44.1, 48, 96 kHz

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Details:
Universal: Yes
Minimum OS version: 17.0

waka_x

ace:) wild one.
thanks Zoli!

egobeats

Love @zoltan 's stuff. All of his apps are fantastic.

gusgranite

Weapon on 303. Love it.

quantovox

There will be a more in-depth demo dropping later, featuring a wider range of guitars (and it will venture into a few non-guitar examples).

https://www.youtube.com/shorts/iIRNzQHRGFY

Schmotown

@quantovox do you plan to release this for Mac, too?

Squishy

@quantovox said:
There will be a more in-depth demo dropping later, featuring a wider range of guitars (and it will venture into a few non-guitar examples).

https://www.youtube.com/shorts/iIRNzQHRGFY

Great fx demo, multitude of different sound sources. Wish other devs did the same.
(Forgot how good Jamie was at slappin the shit out of a bass 🤘)

quantovox

@Schmotown said:
@quantovox do you plan to release this for Mac, too?

Normally the answer would be a reference to what was said when Ringotron was certified for Apple Silicon:

After stepping back for 25 months, we're willing to give the model another try. Whether we'll do any universal releases at all in future will largely depend on the outcome of this.

Short answer is not yet, or at least it's in a deferred state. Due partly to the above, and other reasons encompassing multiple plugins both released and under development.

Although since Melthaven introduced IAP's, there may be other options than waiting for that positive outcome mentioned earlier...
If you have suggestions or feedback of any kind about this, please send it via e-mail.

_smund

It sounds good!

eylvy

synths demo: