Hi again, I had a go at exercise 5 over Christmas:
Measures 1-4: I wanted to give the staccato bass notes on the bassoon a go, so I started out like that. I brought an oboe in to emphasize the first lengthy melodic note, and to build tension for the abrupt stop in the next bar where the flute and oboe jump to the A.
I doubled the flutes in octaves for the next part; I felt it needed more than in the first two bars seen as I'd brought the oboe in. Then there's a moment of tension where the staccato bass notes stop during measure 4, then for the next prolonged melody note most of the instruments come in to lead into main body of the piece.
Measures 5-8: I kept the flute and oboe in unison as one voice for the main melody, as was at the start of measure 3. For another voice, doubling an octave higher, I brought a clarinet in to play in unison with the higher flute.
There's also another voice that plays in measures 6 and 8, this is played by an oboe and bassoon in unison. In measure 8 this is what leads into the ending.
The other remaining instruments (clarinet and bassoon) are playing a low resonace part. It is likely they will be replaced by horns in the next exercise.
Measures 9-12: The oboe and bassoon voice leads into the ending and continues to play the melody, (hopefully) giving the effect that one melody was replaced by another which rose up and overpowered it. The only original "melody instrument" which remains is the flute, just to keep it sounding sweet and soft. The flute will probably get pretty much drowned out anyway, right?
The lower clarinet and bassoon continue with the resonance part and right at the end the other bassoon plays some descending notes just to release the energy and finish it off.
Thanks for taking the time to help me out with this.