FAC Polyflo vs SignatureRVB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FAC Polyflo
This AUv3 plugin allows you to modulate and sequence MIDI instruments and modular hardware. It outputs both MIDI and analog CV simultaneously, supporting hybrid digital and analog setups. Convert various signals into control voltages for deep and flexible modulation.
- AUv3 plugin for modulation and sequencing
- Outputs MIDI and analog CV simultaneously
- Converts signals to control voltages
- Two LFO generators with syncing
- Integrated envelope follower
- Six FLO(W) processors for signal shaping
- Universal Purchase for iOS, macOS, Vision Pro
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• AUv3 plugin to modulate and sequence MIDI instruments and modular hardware • Outputs MIDI and analog CV simultaneously for integrated hybrid setups • Fully functional in software-only environments with full MIDI support • Converts LFOs, MIDI notes, pitch, and control changes into control voltages • Includes two LFO generators with random spline, cross-modulation and syncing • Integrated envelope follower to track audio input or sidechain signal • Six FLO(W) processors for combining and shaping signals with math and logic • Each FLO supports 18 inputs with individual polarity, divider and multiplier • Multi-out support, built-in waveform viewer, Audio FX, and MIDI FX • Advanced Responsive Design, portrait and landscape views • Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro FAC Polyflo is an AUv3 plugin for modulating and sequencing MIDI instruments and modular gear via control voltage. It outputs MIDI and analog CV simultaneously, making it well-suited for hybrid setups that combine digital and analog equipment. The plugin includes two LFO generators offering 10 waveforms, including classic shapes and random spline, with support for cross-modulation and syncing. It also features an envelope follower that tracks audio FX input or an external sidechain. The generated signals, together with the host clock and MIDI input, are fed into six independent FLO(W) processors. These processors combine, shape, and route inputs using math operations, conditional logic, and comparators. Each FLO includes individual polarity, division, and multiplication controls, providing deep and flexible modulation that balances chaotic creativity with precise timing. Each FLO processor output is connected to its own output bus, enabling easy integration with hardware via DC-coupled audio interfaces like the Expert Sleepers ES-9. For simpler setups, FLO outputs can be routed to the stereo output. FAC Polyflo can also convert MIDI notes, pitch, and control changes into control voltages, making it a powerful MIDI-to-CV solution. If you prefer to work exclusively with software, the plugin runs smoothly in software-only environments with full MIDI support, making it equally suited for purely digital workflows. FAC Polyflo works as both an Audio Unit FX and MIDI FX, featuring a clean, touch-optimized interface with precise control and waveform visualization. It’s available as an AUv3 for iOS (iPad/iPhone), macOS, and Vision Pro, and requires a compatible AUv3 host app to run. This is an AUv3 Effect and requires a compatible host to work The documentation is available at fredantoncorvest.com/FAC_Polyflo.html
SignatureRVB
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SignatureRVB - Reverb Effect · AUv3 SignatureRVB is a professional stereo reverb plugin for iPhone and iPad, built on the classic Freeverb algorithm - the same architecture used in high-end studio hardware and software for decades. Load it in any AUv3 compatible host and dial in anything from tight room ambience to lush cathedral reverb with six intuitive rotary controls. Six Controls. Infinite Spaces. DRY / WET - blend the original signal with the reverberated output SIZE - set the virtual room from a small booth to a concert hall DECAY - control how long the reverb tail sustains DAMP - shape the high-frequency character of each reflection PRE-DELAY - add up to 100 ms of separation between signal and reverb onset WIDTH - spread the reverb across the stereo field Professional Design Hardware-style rotary knobs with graduation marks and real-time value display. Responsive layout adapts to any host window size on both iPhone and iPad. Technical Freeverb algorithm: 8 parallel comb filters + 4 series allpass filters per channel Stereo processing with independent L/R filter states Zero latency · Zero allocation on audio thread Full preset and automation support Compatible with AU EngineCore & all AUv3 hosts #nobodysbanda
Screenshots
Verdict
The clearest difference is in-app purchases: SignatureRVB at none against FAC Polyflo's 3. SignatureRVB also leads on price ($5.99 vs $9.99). FAC Polyflo's advantage is chart position (#181 vs unranked). On ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
FAC Polyflo costs $9.99 and SignatureRVB $5.99 up front. FAC Polyflo sells 3 one-off in-app purchases. SignatureRVB asks for nothing beyond the download.
| Parameter | FAC Polyflo | SignatureRVB |
|---|---|---|
| Price | $9.99 | $5.99 — better |
| Rating | 4.9 (11 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 11 — better | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | — |
| Best chart rank | #181 — better | — |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Frederic Corvest | Antonio Sorin TASU |
In-app purchases
FAC Polyflo
- Small Tip$1.99
- Medium Tip$4.99
- Large Tip$14.99
SignatureRVB
No in-app purchases







