Capacitor Identification

Hi

recently I managed to lay my hands on a citronic sm650 dj mixer which is considered by many to be a good sounding dj mixer.
Unfortunately I am finding the mixer a bit too bright and wonder weather this is caused in part by the capacitor used in RIAA op amps feedback loop.
I am relatively new to electronics and haven't seen a capacitor of this type before it is a 22pf cap (C45) on the schematic and wondered what its dielectric is. The only caps i can find at this value are either ceramic (not recommended for audio) or mica which by all accounts can sound a bit bright. i realise that the brightness could be caused by many other things but the mixer was cheap and i am having fun experimenting with different components.

Since owning the mixer i have replaced the smoothing caps with panasonic fc's they are not burned in yet but yielded a small improvement.
I have also tried changing the op amps from 4558 to TL072 or OP275. I am undecided which ones i like best but both are an improvement over the 4558.

So if someone out there could id this cap for me i'd appreciate it.

thanks

oli

Phone Board Version PC 1141 / 1