12/19/2023 0 Comments Audio wish octave shifter 2Well, of course you can change the speed of a tape delay or analog delay to get glitching effects. By altering tape speed, you can make audio constantly faster and higher, or slower and lower.And they would only work monophonic, that is, on single note melodies. Octaving chords would result in strange noises, sounding a bit like ring modulation. Analog octavers could only do octaves, no other intervals.Like, Jimi Hendrix used both an Octavio (analog pedal) and half speed recording on “ Purple Haze” to create octave-up effects.īoth technologies had their shortcomings: And you could use quite simple analog circuitry to create octaves above or below the original signal. In the pre-digital age, there were mainly two ways to alter the pitch of a signal: You could make audio (like, a vinyl record or a tape) faster/slower to pitch it up/down. Somewhere around 20 Hz / 1200 BPM, our ear switches from hearing a rhythm to hearing a low note. So, 1 Hz is basically the same as 60 BPM. The musical unit for speed is BPM, defined as one beat (cycle) per minute. Our ear hears slow periodical cycles as a rhythms, and faster ones as notes. The physical unit for pitch is Hertz (Hz), defined as a cycle per second. Pitch and speed are physically the same both means frequency of events in time. Boss calls this “true polyphonic octave”, which is plainly wrong. There are pedals that get close, like the Boss OC-3 which has a mode only processing notes below a defined cutoff frequency. You would need an algorithm that can detect and isolate the lowest note played, and octave it down. Creating a monophonic bass line from polyphonic input is a job neither a monophonic nor a polyphonic octaver can do. This works well when playing single notes, but not with chords. Guitar players often want octavers to substitute a bass player. Early digital technology could pitch-shift polyphonic input at lower intervals, but would sound very messy at an octave up/down. Newer algorithms, like the EHX POG’s (introduced in 2005), do polyphonic octaves well. However, analog octavers are not good with polyphonic input, like chords they work well with single note lines, generating monophonic output from them.ĭigital pitch shifters (marketed as “Harmonizers” by Eventide) came up mid 1970s. An octave up/down physically means exactly doubling/halving frequency, which was used in music since the 1960s. But it couldn’t be used live on stage.Įnter pitch shift technology: Creating octaves up or down can be easily done with analog technology. Altering the speed of tape machines while recording was an early method to achieve pitch effects. Spin a record faster, and the music will become both faster and higher in pitch.
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