WIP: prepare the ground for audio rate modulation

crates/forth/src/words/compile.rs

@@ -104,6 +104,17 @@ pub(super) fn simple_op(name: &str) -> Option<Op> {
         "mstop" => Op::MidiStop,
         "mcont" => Op::MidiContinue,
         "forget" => Op::Forget,
+        "lfo" => Op::ModLfo(0),
+        "tlfo" => Op::ModLfo(1),
+        "wlfo" => Op::ModLfo(2),
+        "qlfo" => Op::ModLfo(3),
+        "slide" => Op::ModSlide(0),
+        "expslide" => Op::ModSlide(1),
+        "sslide" => Op::ModSlide(2),
+        "jit" => Op::ModRnd(0),
+        "sjit" => Op::ModRnd(1),
+        "drunk" => Op::ModRnd(2),
+        "env" => Op::ModEnv,
         _ => return None,
     })
 }