Playing unprepared

[DoubleBlade]

What must one look out for when playing unprepared. I'm sure you can't just anyhow whack without following the rules of music?

For example , when I'm playing something impromptu , I noticed that I play too many passing notes which "muffles" the entire melody. Anything else I should look out for when playing impromptu?

Another thing is if I play choose to play in particular scale , how can I incorperate the use of modes in my playing?

Suppose if I play in G Major (F#) and I hit the D key. Can I choose to play a D dorian instead or when I hit a G key , can I choose to play a G mexolydian instead? Because both D dorian and G mexolydian does not have an F# but a F instead?

 

[spikes]

make it sound jazzy, you notice jazz got these kinda sounds, why you recorded something unprepared ar? if so post it up lar...then we can help you...

 

[DoubleBlade]

I posted this up on the OM before...

http://s43.yousendit.com/d.aspx?id=1WIPDL6SBDUMH134GC2UGN00DE

After listening to it over a few times , I noticed that I tend to play too many passing notes that kinda makes the melody "muffled"

This was recorded before I found out that I could actually make use of modes....

I also feel that it sounds kinda empty in a sense that it does not really sound that jazzy , could it be because of the absence of modes?