Event type \phrase, multichannel expand \instrument

Questions
1

I am using the \phrase event type and would like to call multiple phrases at once via the \instrument parameter.
Here is an example:

Pdef(\top, 
	Pbind(
		\type, \phrase,
		\instrument, Pseq([\p1, \p2, [\p1, \p2]], inf),
		\dur, 2
	)
);

Pdef(\p1, 
	Pbind(
		\dur, 1/8, 
		\degree, Pseq((1..4))
	)
);

Pdef(\p2, 
	Pbind(
		\dur, 1/12, 
		\degree, Pseq((1..-6))
	)
);

There is an error when it encounters [\p1, \p2]
Any clues how this could be changed to make it work? Thanks!