Ear Tone Toolbox

The Ear Tone Toolbox
Alex Chechile


Main Unit Generators:

DiffTone generates the primary tone combinations needed for evoking the user defined quadratic and cubic difference tones, which are produced in the listener’s ears. Optional guide tones producing sine waves at the frequencies of the QDT and CDT are provided, but should only be used for reference since the guide tones will mask the distortion products in the ear.

DPSpecS generates a stereo spectrum of primary tones based on the f1 primary tone and the f0 quadratic difference tone fundamental, which is also the spacing between subsequent primary tones. The primary tone ratio is constrained to help produce robust distortion products, but some out of range combinations may still be possible. Optional guide tones producing sine waves for f0 QDT and f0 multiples are provided, but should only be used for reference since the guide tones will mask the distortion products in the ear.

f1half evokes the user defined QDT or CDT while also allowing control over the lower primary tone, f1. To use this unit generator, the user must set the other unspecified distortion product to 1 (but the unspecified DP will still be produced). The primary tone ratio is constrained to help produce robust distortion products, but some out of range combinations may still be possible. Optional guide tones producing sine waves at the frequencies of the QDT and CDT are provided, but should only be used for reference since the guide tones will mask the distortion products in the ear.

f1ratio provides the user control over the primary tone ratio for producing quadratic and cubic difference tones. Optional guide tones producing sine waves at the frequencies of the QDT and CDT are provided, but should only be used for reference since the guide tones will mask the distortion products in the ear.

Unit Generator Variations:

DPSpec is the multichannel version of DPSpecS allowing for individual processing on each component as well as multichannel output. DPSpecS_unlim and DPSpec_unlim are unconstrained versions of their respective generators, but the f2/f1 ratio may exceed usable range for producing audible distortion products. f2half is a variation of f1half allowing the user control over the higher f2 frequency. f1half_unlim and f2half_unlim are unconstrained versions of their respective generators, but the f2/f1 ratio may exceed usable range for producing audible distortion products.

VSTi Instrument Versions & Variations:

DiffTone_QDT_Mono and DiffTone_QDT_Poly are monophonic and polyphonic instruments for use with MIDI controllers such as a keyboard. The pitch of the MIDI note input is evoked as a QDT, and the CDT is user specified within the plugin. The amplitude of the polyphonic version is lower than the monophonic version as to accommodate for multiple voices.

DPSpecS_QDT_Mono and DPSpecS_QDT_unlim_Mono are monophonic instruments for use with MIDI controllers such as a keyboard. The pitch of the MIDI note input is evoked as a QDT in the listener’s ears, and the f1 primary tone (and resulting spectrum) is user specified within the plugin. The DPSpecS_QDT_Mono version is constrained to help produce robust distortion products, but some out of range combinations may still be possible. The DPSpecS_QDT_unlim_Mono version is unconstrained, but the f2/f1 ratio may exceed usable range for producing audible DTs.

DPSpecS_PT_Mono and DPSpecS_PT_unlim_Mono are monophonic instruments for use with MIDI controllers such as a keyboard. The pitch of the MIDI note input is the lowest primary tone (PT) of the acoustic spectrum, and the f0 QDT value is user specified within the plugin. The DPSpecS_PT_Mono version is constrained to help produce robust distortion products, but some out of range combinations may still be possible. The DPSpecS_PT_unlim_Mono version is unconstrained, but the f2/f1 ratio may exceed usable range for producing audible DTs.

f1ratio_Mono and f1ratio_Poly are monophonic and polyphonic instruments for use with MIDI controllers such as a keyboard. The pitch of the MIDI note input is the f1 primary tone, and the primary tone ratio is user specified within the plugin. The amplitude of the polyphonic version is lower than the monophonic version as to accommodate for multiple voices.

f1half_Mono and f1half_Poly are monophonic and polyphonic instruments for use with MIDI controllers such as a keyboard. The instruments evoke the user defined QDT or CDT while also allowing control over the lower primary tone, f1 by MIDI input. One of either the QDT or the CDT values must be set to 1 for the VSTi to work. The instruments are constrained to help produce robust distortion products, but some out of range combinations may still be possible. f1half_unlim_Mono and f1half_unlim_Poly are unconstrained, but the f2/f1 ratio may exceed usable range for producing audible DTs.

f2_half_Mono and f2_half_Poly are monophonic and polyphonic instruments for use with MIDI controllers such as a keyboard. The instruments evoke the user defined QDT or CDT while also allowing control over the higher primary tone, f2 by MIDI input. One of either the QDT or the CDT values must be set to 1 for the VSTi to work. The instruments are constrained to help produce robust distortion products, but some out of range combinations may still be possible. f2half_unlim_Mono and f2half_unlim_Poly are unconstrained, but the f2/f1 ratio may exceed usable range for producing audible DTs.

VST Effects

The VST effects allow the unit generators of the Ear Tone Toolbox to be used within a DAW environment through manual control or automation. The VST effects are not signal processing effects, but will pass audio in the signal chain. Note the gain is set to 0 by default. For MIDI instrument control, use the provided VSTi plugins.

OWL Modular Versions & Variations:

DiffTone_dual is a dual version of DiffTone using all four of the OWL knobs. From left to right, the first two knobs control the first pair of QDT and CDT with the signal output from the L out, and the next two knobs control the second pair of QDT and CDT with the signal output from the R out.

DiffTone_SC_Mono outputs both primary tones from out L, and provides optional guide tones from the out R. From left to right, the knobs control the QDT, the CDT, the volume for the QDT guide tone, and the volume for the CDT guide tone. The guide tones should only be used for reference since they will mask the distortion products in the ear.

DiffTone_SC_Stereo outputs the f1 primary tone from the L output, and the f2 primary tone from the R output. An optional guide tone for the QDT can output from the L out, and an optional guide tone for the CDT can output from the R out. From left to right, the knobs control the QDT, CDT, volume for the QDT, and volume for the CDT. The guide tones should only be used for reference since they will mask the distortion products in the ear.

DPSpecS and DPSpecS_unlim, see description of main unit generators above. Knobs from left to right: f0 and f1 (right knobs unused). F1 from output L and f2 from output R.

f1half and f1half_unlim, see description of main unit generators above. Knobs from left to right: f1, QDT, CDT (right knob unused). To use, either one of the QDT or the CDT knobs must be set fully counterclockwise. F1 from output L and f2 from output R.

f2half and f2half_unlim, see description of main unit generators above. Knobs from left to right: f2, QDT, CDT (right knob unused). To use, either one of the QDT or the CDT knobs must be set fully counterclockwise. F1 from output L and f2 from output R.

f1ratio_dual is a dual version of f1ratio using all four of the OWL knobs. From left to right, the first and second knobs control the f1 and ratio of the first generator, and the second pair control the second generator in the same order. The first pair is output from out L and the second pair is output from the out R.

f1ratio_SC_Mono outputs both primary tones from out L, and provides optional guide tones from the out R. From left to right, the knobs control the f1 primary tone, the ratio, the volume for the QDT, and the volume for the CDT. The guide tones should only be used for reference since they will mask the distortion products in the ear.

f1ratio_SC_Stereo outputs the f1 primary tone from the L output, and the f2 primary tone from the R output. An optional guide tone for the QDT can output from the L out, and an optional guide tone for the CDT can output from the R out. From left to right, the knobs control the f1 primary tone, the ratio, the volume for the QDT, and the volume for the CDT. The guide tones should only be used for reference since they will mask the distortion products in the ear.


 



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