[chuck-users] Envelope.last()

can Envelope work like SinOsc to control ugen parameters? meaning, something like this, hacked from the lovely ChucK manual blackhole example: SinOsc s => dac; Envelope e => blackhole; 10. => lfo.time; s.freq = 220.; e.target(440.); while (20::ms => now){ e.last() => s.freq; } ? it doesn't work, and it seems that e.last() doesn't actually give you anything. obviously there are other ways to do this, but i'm trying to *learn* here! takk, dan