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[sc-dev] UnaryOpUGen with dbamp and ampdb broken for audio-rate?

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Hi,

I think there is a severe problem here with some unary ops and audio-rate.

Compare:

 play {
   var lin;
   var in = DC.kr(0);
   var db = in.ampdb;
   db.poll(0, "db");
   lin = db.dbamp;
   lin.poll(0, "lin");
   0.0
 }

 // db: -inf
 // lin: 0.0

OK!

 play {
   var lin;
   var in = DC.ar(0);  // audio-rate!
   var db = in.ampdb;
   db.poll(0, "db");
   lin = db.dbamp;
   lin.poll(0, "lin");
   0.0
 }

 // db: -764.616   huh?
 // lin: -nan      WTF !?!


This is with SC 3.6.5; I don't know if this is fixed in master? Looks
like a very severe bug to me.
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