A. Make sure these commands are set to a number you'd feel comfortable with. I recommend the following:
// > Hit and killsounds
tf_dingaling_lasthit_pitchmaxdmg 50 // High damage, low pitch
tf_dingaling_lasthit_pitchmindmg 140 // Low damage, high pitch
tf_dingaling_pitchmaxdmg 50 // High damage, low pitch
tf_dingaling_pitchmindmg 140 // Low damage, high pitch
Otherwise, make sure your hitsound isn't just a bass note.
I hate to be rude, but with the previous comment, yes, don't be stupid.