A more subtle application of FM (frequency modulation) than found in the ”In A Bad Moog” example’s “instability” control.
In this case, the ratio is 3:1 (ratio="3"), creating a stable metallic timbre. The <modulator-blam> has a shorter curve than its parent <carrier-blam>, meaning the metallic timbre is only at the start of the sound. The effect is a pseudo-steel drum sound.
<synth-blam class="steel" notes="C4 D4 E4 G4 A4 C5 D5 E5 G5 A5" out="bus">
<carrier-blam curve="0 0, 1 0.03, 0 2">
<modulator-blam curve="0 0, 1 0.03, 0 1.25" ratio="2" gain="500">
<blam-blam prop="gain" value="100~2000"></blam-blam>
</modulator-blam>
</carrier-blam>
<carrier-blam curve="0 0, 1 0.02, 0 0.06" release="2" offset="-12">
</carrier-blam>
<envelope-blam prop="detune" curve="0 0, -35 0.25, 0 0.7"></envelope-blam>
</synth-blam>
The <blam-blam> element fluctuates the <modulator-blam> element’s gain, simulating softer versus harder hits of the drum. The second <carrier-blam> emits a very short, detuned knocking sound and the <envelope-blam>, affecting detune, creates a slight bowing effect for added authenticity.
Consult the Synthesis guide for more context.