Capacitor

Reducing the value not a good idea ,when engineered the UF needs to be the same in s amp,preamp, in a loudspeaker 
maximum different change under3%
bypass caps for small  values very common to use .01 uf 
the vh audio Cu Copper Teflon are excellent as PauL mentioned
the VH CU is superior to the Odam  and can be used values .01 
are typically used in the HF range,but can put on a midrange also.

I would not use a bypass cap in a crossover. Don’t think they sound right in this application. Makes the sound sort of nervous. One great cap is better. Bypass caps are great in power supplies and SOMETIMES in coupling and output positions. It depends on the combo of caps used. 

Odam and Cutf sound wonderful together in electronics.  The .01uf Cutf combined with a .22-3 uf Odam works great.  You get a little more air and detail.  
I personally prefer the sound of Odam over the Cutf used alone. The Cutf is just too lively and exposing for  my tastes. This is a personal preference thing for me however. 

@grannyring 

Are you talking speaker or electronics, or both? 

I used Duelund  JDM-AG bypass on Jupiter VT in my crossovers to good effect. Affected all freq. a little more insight, like lowering noise floor.

My post spelled that out if you go back and look at it. Bypassing does not always work well.  Trial and error at best. Some combos don’t sound quite right. I know Odam and Cutf work well in electronics.  I don’t like bypassing in crossovers as often times the result while impressive at first, more air and details, in the end can sound a tad nervous and not quite right.  Bypassing with film caps in power supplies with electrolytic caps is most always a nice plus.