High voltage capacitors in audio

In a pre-amplifier, I am replacing all relevant capacitors in signal
lines by 100V or 250V polypropylene film capacitors (i.e. big yellow
ones). These are much better for audio than standard alu elcos.

My question is:

1) the signal is only a couple of volts in amplitude. Is it bad that
the capacitors are way beyond this value? I mean, could it be that
these big caps handle low voltages not as well?

2) is it actually a good idea to replace *all* of these capacitors by
these big ones? (if you'd like, look at the circuit at <http://
sound.westhost.com/project24.htm>) Or would some good, small tantalum
capacitors do better in some locations?

.

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