keroberos OK, here's a tip: To not clip the sound you need either limiter or compressor. there is no limiter in construct but limiter is a compressor with ratio of 50+. So what you need to do is to set it in the following way: Threshold: -1, Ratio: 50 or more, Attack:1, Release: 1000. The downside is that it only works with advanced audio enabled. ( Knee: don't know how it works in construct as i see that i can set it to some stupid numbers @Ashley how knee works here in c2 compressor? )
So if you can't use compressor, then you've got to remember that same two sounds played at exactly same time will increase the overall volume by 3db. If they are not the same, the volume output varies. Fairly safe bet would be to set all sounds to -5db or -6db at sounds highest picks, but weather you'd rich clipping or not would depend on how many sounds you play simultaneously. Also you can make sound seam louder if you roll over sub from the sample using eq. This way you will get rid of unheard part of the sound, but it will make the sound sound louder without actual increase in volume.
EDIT@ I see that filter in advanced audio actions can be used for rolling of parts of frequencies. So set it to high-pass at frequency between 80 and 300hz. Make sure you don't loose any audible information by checking did it change the sound or not. Push it till you hear the change, then lower it slightly. Set Gain to 0, detune to 0.
@Ashley In filter is the Q inverted or not? Many eq's have got inverted Q, which means the higher the number the narrower the band.