hi i've had a cold for about two days, and yesterday (when it was at its worse) i didn't practice because i was simply too "weak". today i'm feeling a little bit better and i was practicing and i was surpised to hear that my sound was drastically worse than normal. it was very muted, and although i knew i was supplying plenty of air it didn't sound like it. my sound just didn't have that sort of rich vibrant property it normally has. does this have any relation to my cold, or is it more becaue i skipped a day of practice (which i almost never do)? has anyone else experienced a similar problem or is it just me?