Hi,
If you know the input impedance of the next piece in the gear lineup, you can calculate the needed value to prevent roll off and possible distortion. Google for this formula. It seems most gear is designed for very low input impedance, one size fits all. I find that most values can be reduced(I have all tube equip). I would think that going from 5 to 3 should only be a problem(sound wise) in the one in a thousand. That said, remember if you change that next piece of gear for something else, you need to qualify you choice of capacitance value for the new gear!
If you know the input impedance of the next piece in the gear lineup, you can calculate the needed value to prevent roll off and possible distortion. Google for this formula. It seems most gear is designed for very low input impedance, one size fits all. I find that most values can be reduced(I have all tube equip). I would think that going from 5 to 3 should only be a problem(sound wise) in the one in a thousand. That said, remember if you change that next piece of gear for something else, you need to qualify you choice of capacitance value for the new gear!