[PD] synchronising of oscillators

[thomas gorbach]

Hello everybody

i'm playing with oscillators. Now i have the problem that different 
oscillators on the same pitch don't have constant volume if i change 
there pitch together.
example:
8 oscillators all with pitch 160 Hz are louder than 163 Hz.
i think it's because they are overlapping each other.
Is there a object to synchronize the oscillators ?

Greetns
TOM