How about some psychedelic sadness?
Samples of two bars of finger-plucked guitar cycle endlessly while a <filter-blam> of type="bandpass" sweeps between lighter and darker frequencies. A spring reverb is added via <reverb-blam> for depth.
<reverb-blam id="spring" mix="0.25">
<sample-blam src="{{site.basedir}}/static/sounds/IRs/spring.mp3"></sample-blam>
</reverb-blam>
To emulate the unsteady motion of a foot operating a wah pedal, a <blam-blam> fluctuates the gain of the <lfo-blam>.
<filter-blam type="bandpass" freq="850" q="3">
<lfo-blam id="pedal" prop="freq" gain="500" beats="0.75">
<blam-blam
from="sequencer-blam"
to="#pedal"
prop="gain"
value="200~600"
ramp="0.125"
chance="0.5">
</blam-blam>
</lfo-blam>
</filter-blam>
A <dial-blam> is included for changing the position from “towards the heal” to “towards the toe”. This determines the general area in which the foot motion is occuring. It is mapped to the <filter-blam>’s center frequency (freq).
<dial-blam to="[type='bandpass']" prop="freq">
<label>
position
<input type="range" min="600" max="1400" step="any">
</label>
</dial-blam>