Generally web audio works well with DART.

a. A bit of a hastle to generate web pages until everyone switches to the current W3C spec. But this will eventually get solved.

b. Not surprisingly convolver effects are not ideal with chords (simultaneous notes). The result mostly seems to comply with the specs (producing poor quality sound on my machine) although the the result is sometimes an "aw snap" web page crash. The crash is almost surely not a DART problem. Chrome should probably more gracefully drop processing when the CPU load gets too high. (However, this is just speculaion.)

c. It is a bit tricky to get things to load nicely, because initially the music is a bit odd. It improves after a few seconds and "rewinds" produce good results. (I have not tried workarounds yet. )
[Currently the music begins shortly after the future completes loading the buffers.]
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Editor: 0.7.6_r28108 (2013-10-01)
OS: Windows XP - x86 (5.1)
JVM: 1.7.0_25

projects: 3

open dart files: 26

auto-run pub: false
localhost resolves to: 127.0.0.1
mem max/total/free: 967 / 365 / 59 MB
thread count: 38
index: 275104 relationships in 53511 keys in 243 sources

SDK installed: true
Dartium installed: true