proxyspace // using Pbindef property

[email protected]
Newsgroups gmane.comp.audio.supercollider.user
Message-ID <[email protected]>
hey everyone, hope you are all doing good. I have a question about 
proxyspace mapping I have a simple buffer player and this is its pattern

(Pbindef(\track1,
\instrument, \vplaym,
\buf, d["bd"][0],
\dur, 1,
\atk, 0.01,
\rel,1,
\pos, 0,
\pan, 0,
\rate,Pseq([2,0.2,0.5],inf),
\amp,0.2
))
~track1.play
~track1= Pdef(\track1)

And I have some modulation that I mapped to \rate

~mousey= {MouseY.kr(0.1,3,lag:0.1)}
~track1.map(\rate, ~mousey)

I am modulating \rate with another proxy and it works fine by overriding 
the pattern thats allready there,  I want to be able to use the pattern too

something like this,

~track1.map(\rate, \rate.value * ~mousey)

is there any way to this kind of operation?
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