FAC Gravity vs AuTranspose

FAC Gravity AUv3 Plugin is a frequency shifter for creating Barberpole and Shepard style glissandos, spectral illusions, stereo rotation, chorusing, phasing, evolving echoes, infinite cosmic spaces, and all the combinations you’ll make. The plugin gives you two ways to process the audio source. In Stereo mode, each channel is shifted independently, with a Ratio control determining how closely their frequency shifts align. In Mono mode, FAC Gravity extends the internal quadrature processing to create a wide stereo image from the mono source. The frequency shift can move up or down, from subtle to more extreme spectral transformations. You can set the amount in Hz for classic Bode-style frequency shifting, make it follow your host tempo for rhythmic patterns, or even control it from MIDI notes for a more hands-on approach. A new dimension appears when you let the shifter feed back into itself with Spiral, a customizable loop with delay, blur, filtering, and different characters that shape how the sound circles, smears, interacts, and evolves over time. The result can range from bubbling textures to infinite sustained tones and noisy analog self-oscillation. Each character takes the feedback somewhere different. To dive deeper into new sonic dimensions, FAC Gravity comes with its own modulation module. The LFO, envelope follower, and flexible modulation matrix let you animate most parameters, from subtle evolving movements to complex, rhythmically reactive changes. You can even make the stereo field animate and rotate continuously by making the Width, Phase, and Pan parameters spin! You can shape the effect further by blending the processed signal with the original, while the optional limiter keeps the most extreme combinations in check. • Barberpole glissandos, spectral illusions, rotating stereo, evolving echoes • Dual Frequency Shifting, or Mono Shifting with Quadrature Stereo Widening • Organic Spiral Loop, from gentle feedback to pure analog self-oscillation • Integrated delay, diffusion blur, and independent low/high filtering • Modulation matrix, multi-source envelope follower • LFO with classic waveforms and random spline • Spinning modulation to rotate and animate the stereo field • Tempo-synced or MIDI-driven Frequency Shift, LFO, and Delay • Dry/Wet mix, optional limiting, and goniometer visualization • Advanced Responsive Design, portrait and landscape views • Universal Purchase: AUv3 for iOS (iPad/iPhone), macOS and Vision Pro The documentation is available at fredantoncorvest.com/FAC_Gravity.html This is an AUv3 Effect and requires a compatible host to work The in-app purchases are for tipping only, the app is fully functional without them

AuTranspose is a simple pitch-shifting / transpose utility plugin with a range of +/- one octave in semitones, and a +/- 100 cents detune (semitone up or down). Please note that AuTranspose has audio latency (see the PLEASE READ section below) so it is not really suitable for realtime pitch shifting in situations where timing is critical - for example, shifting the pitch of an instrument as you play it or syncing multiple tracks in a live performance. AuTranspose is an AUv3 effects plugin that can run standalone, or in any AUv3 compatible host such as Logic Pro, GarageBand or AUM. AuTranspose currently runs on iPadOS / iOS (iPad & iPhone) and macOS (Intel & Silicon) and is available as a Universal Purchase from the Apple App Store. If you’re planning on using AuTranspose on Mac / desktop, please ensure that your favourite DAW / host supports AUv3 (not just AU). PLEASE READ THIS SECTION CAREFULLY! AuTranspose uses a pitch shifting technique that adds latency (delay) to the processed audio. Please note that this is unrelated to your audio interface buffer size or sample rate. The quality of the pitch conversion is a compromise between low latency or decent quality results - unfortunately, you can’t have both. AuTranspose can get as low as around 25ms latency which is just about good enough for a guitar octaver type application, but will probably sound a bit “wobbly” / “lo-fi” on more general audio. If you’re interested in a more guitar-centric octaver, please check out OttavaBassa which uses similar DSP, but tuned for guitar. AuTranspose does not report its latency to the host! This is by design. Instead, the current latency is shown on the UI in samples (and ms) so you can decide yourself if you need to compensate for it - for example, when remixing projects and you need to re-sync tracks that aren’t going through AuTranspose. So what is it for, and why did I make it? In my own search for a simple pitch shifter, I found that the really simple ones didn’t sound so good, and the ones that did produce good results were fairly complicated and / or CPU intensive. So I tried to make something that was very simple to use, that produced reasonable results. When might AuTranspose be useful? Backing tracks: You might want to transpose up or down by a semitone or two to put the song in a more comfortable key to sing, or perhaps you tune your guitar to Eb. In these situations, you could probably transpose the whole track up or down and it’ll still sound OK. The only other thing to keep in mind is that the playback of the track will be delayed by the latency so as long as the backing track doesn’t have to sync with anything else, you should be fine. Remixing recorded projects: Perhaps you have a project that’s audio only and you’ve decided it needs to be in a different key. You could use AuTranspose to pitch-shift the tracks or stems that need to be in key, but leave the percussion tracks as they are. You can then add a sample length delay (*) to these tracks so that everything plays in sync. For convenience AuTranspose reports the number of samples to adjust by. And of course, you could simply use AuTranspose as an effect in itself, for example as a “Lo-Fi” pitch shifter for a retro vibe. There are a few examples in the factory presets to get you started. (*) In cases where you need to compensate for latency on tracks that aren’t using AuTranspose, add a sample delay plugin to those tracks and set the number of samples to what’s reported on the AuTranspose UI. There are several sample delay plugins available, although many of the free ones (Apple’s included) don’t go that high. By the time you read this, MicroLag should be available which supports longer delay times.