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<font size="+2" color=#004060><b>TAP</b>-plugins</font><br>
<font color=#004060>Tom's Audio Processing plugins</font><br>
<font size="-1" color=#004060><i>for audio engineering on the Linux
platform</i></font>
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<a href="../ladspa.html">[ LADSPA plugins ]</a>
<a href="../reverbed.html">[ TAP Reverb Editor ]</a>
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<a href="releases.html">[ Releases ]</a>
<a href="general.html">[ General Info ]</a>
<a href="manuals.html">[ Plugin Manuals ]</a>
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<blockquote>
<a href="autopan.html">[ TAP AutoPanner ]</a>
<a href="chorusflanger.html">[ TAP Chorus/Flanger ]</a>
<a href="deesser.html">[ TAP DeEsser ]</a>
<a href="dynamics.html">[ TAP Dynamics (Mono & Stereo) ]</a>
<a href="eq.html">[ TAP Equalizer and TAP Equalizer/BW ]</a>
<a href="doubler.html">[ TAP Fractal Doubler ]</a>
<a href="pinknoise.html">[ TAP Pink/Fractal Noise ]</a>
<a href="pitch.html">[ TAP Pitch Shifter ]</a>
<a href="reflector.html">[ TAP Reflector ]</a>
<a href="reverb.html">[ TAP Reverberator ]</a>
<a href="rotspeak.html">[ TAP Rotary Speaker ]</a>
<a href="limiter.html">[ TAP Scaling Limiter ]</a>
<a href="sigmoid.html">[ TAP Sigmoid Booster ]</a>
<a href="echo.html">[ TAP Stereo Echo ]</a>
<a href="tremolo.html">[ TAP Tremolo ]</a>
<a href="tubewarmth.html">[ TAP TubeWarmth ]</a>
<a href="vibrato.html">[ TAP Vibrato ]</a>
</blockquote>
<h2>TAP Pitch Shifter</h2>
<img src="tap_pitch.png" alt="[TAP Pitch Shifter GUI as shown in Ardour]">
<p>
This plugin gives you the opportunity to change the pitch of
individual tracks or full mixes, in the range of plus/minus one
octave. Audio length (tempo) is not affected by this plugin, since
audio is completely resampled. Besides being a special effect for
creating foxy guitar tracks, it may come handy if your (otherwise very
attractive) singer or chorus-girl was a bit indisposed at the time of
recording: with the power of Ardour automation, you are given a chance
to correct smaller pitch errors.
</p>
<h3>General information</h3>
<table cellspacing="0" cellpadding="5" border="1">
<tr><th align="left">Unique ID</th><td>2150</td>
<tr><th align="left">I/O ports</th><td>1 input / 1 output</td>
<tr><th align="left">CPU usage (44.1 kHz)</th><td>7.4%</td>
<tr><th align="left">CPU usage (96 kHz)</th><td>16.3%</td>
<tr><th align="left">Hard RT Capable</th><td>Yes</td></tr>
<tr><th align="left">In-place operation</th><td>Supported</td>
<tr><th align="left">run_adding() function</th><td>Provided</td>
</table>
<h3>Usage tips</h3>
<p>
There are two controls to set the same thing: you can set the amount
of pitch shift by either setting the "Semitone Shift" or the "Rate
Shift" control. The former is scaled in semitones, allowing you to set
musically sensible pitch shift rates. The latter is scaled in
percentage of the original pitch, so that is closer to a "physical",
non-musical approach.
</p>
<p>
The available pitch shift range is one octave up or down. One octave
downwards (-12 semitones) corresponds to a setting of -50% of the
"Rate Shift" control, one octave upwards (+12 semitones) corresponds
to a "Rate Shift" setting of +100%. The "Semitone Shift" control has
priority over the "Rate Shift" control in a way that if "Semitone
Shift" is nonzero, it determines the amount of pitch shift in
itself. If "Semitone Shift" is zero, then the "Rate Shift" setting
comes into play. (Note that in Ardour, setting a control back to zero
is as easy as shift-clicking on it.)
</p>
<p>
You can achieve attractive effects by mixing the pitch-shifted signal
together with the original: that's why the "Dry Level" and "Wet Level"
controls are provided. By default, the dry signal is muted, and the
wet signal is output with 0 dB, so you won't need to touch these
contols if you don't want to create such a mix.
</p>
<p>
To thicken the sound of your heavy-metal guitars even further, shift
them down with 12 semitones and mix that with the original sound, with
a level of 2-6 decibels lower than the original. To create harmonies
of a vocal track (simulating another vocalist singing the same thing a
bit lower/higher), apply a pitch shift of 3 or 5 semitones to the
track, and mix it to the original with a slightly lower volume.
</p>
<h3>Summary of user controls</h3>
<table cellspacing="0" cellpadding="5" border="1">
<tr><th>name</th><th>min. value</th><th>default value</th><th>max. value</th></tr>
<tr align="center"><td>Semitone Shift</td>
<td>-12</td>
<td>0</td>
<td>12</td></tr>
<tr align="center"><td>Rate Shift [%]</td>
<td>-50%</td>
<td>0</td>
<td>100%</td></tr>
<tr align="center"><td>Dry Level [dB]</td>
<td>-90</td>
<td>-90</td>
<td>20</td></tr>
<tr align="center"><td>Wet Level [dB]</td>
<td>-90</td>
<td>0</td>
<td>20</td></tr>
<tr align="center"><td>latency</td>
<td colspan="3">varies with sample rate<br>
and pitch shift settings</td></tr>
</table>
<h3>Notes</h3>
<p>
Unfortunately, this plugin is far from being perfect. (Anyone heard of
a perfect pitch shifter?) Varying amounts of phasing effects are
introduced at varying pitch shift rates. The good news is, if you
settle on a particular setting, the side effects of the plugin are
static: no parasite tremolo, vibrato, etc. effects built in, only
static attenuation of certain frequencies due to phase
cancellation. That's not very lovely, but still not as confusing as
some other pitch shifters with strong, time-varying side effects.
</p>
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