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MDS of instrument sounds

Thanks to all who responded to my inquiry on sound databases of musical
instruments. In my next mail I will summarize the responses. 

I plan to do a course room experiment on MDS of musical timbres on
Monday afternoon. It will be small (only four sounds) and informal, but
I want to do it right. If anybody is willing to listen to my sounds and
to give me advice: See postscript.

- Christian

PS: I have prepared four sounds (piano, clavichord, organ, violin). You
can listen to them at
Details of sound generation see file readme.txt. Due to technical
reasons (available CDs), the sounds are rather short (610 ms, with only
about 200 ms full sound for organ and violin), but that should only make
them more comparable and focus attention to timbre (I hope so).

I plan to first demonstrate the four sounds, two or three times each.
Then I will present the six possible combinations, as sound files that
contain the two 610-ms sounds, separated by 500 ms silence, see
I will first cycle two times presenting all pairs. During the third and
last cycle students should mark their ratings on a 9-point (1...9)
dissimilar-similar scale (neutral = 5).

Then I will restart to present the four single sounds, and ask the
students to give their ratings on the following scales (all 9-point
1...9, neutral = 5):
        Klang hell/scharf/brillant --- dumpf/weich/dunkel
                (timbre bright/strident/brillant --- dull/soft/dark)
        Toneinsatz weich/sanft --- hart/abrupt/schlaghaft
                (attack soft/gentle --- hard?/abrupt/beating)
        Klang rauh/uneben --- glatt/gleichmäßig
                (sound rough/harsh/bumby --- smooth/even)
        unangenehm --- angenehm
                (unpleasant --- pleasant)
I would be very happy to hear opinions as to whether these scales are
appropriate guesses of what could be similarity dimensions for those
four sounds. Especially if you have ideas which dimensions I did not ask
for but are more plausible candidate dimensions, or which of those
dimensions I ask for are not appropriate at all and should be skipped,
please let me know. Something that I should do/ not do? Anything else
that I should consider?