[Fluxus] fluxa reversed samples and related matters

[Kassen]

Dear list,

Right now in the redacted branch and perhaps in fluxa, if these were merged
yet, there is a bug with (sample ). I changed that node to playback in
reverse when the frequency is negative. That's a good feature, but now it
has two issues. Once the node is set to play in reverse it will keep doing
so even when it's recycled. This leads to interesting "non determinism" but
clearly that's wrong. Worse is that if a sample is still loading while this
happens Fluxa will crash.

I can fix it, I already had to deal with a related matter for (scrub ) and
hope to do so this weekend. This is more of a warning that right now this is
unsafe. Use (scrub ) with a (ramp ) for your sample-reversing needs.

Other changes I plan to make;

(xfade ) when only fed floats should return a float, not a node, this should
speed things up and relieve some strain on the "node-pool"

(kas-filter ) is by far the most expensive node, cpu-wise. This is partially
a result of extra care in sound quality (with input interpolation) but part
of the blame is likely in calculating a cosine, which could be done with a
table.

Yours,
Kas.
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