Basic question on tonality mapping

[ranga]

Hello,

Sorry, I have a very basic doubt. Consider this:

(activate-tonality (blues1 c 4))

(setq symbols '(-a -b -c b))

I am able to understand how +ve symbols are mapped on to the tonality. But I cannot understand the logic behind -ve symbols. Can you please explain?

Regards,

Rangarajan

[pstone imap]

Hi,

you can get the notes of (blues1 c 4) when you select full (activate-tonality … ) part and press eval.

(activate-tonality (blues1 c 4))

--> ((c 4 d# 4 f 4 f# 4 g 4 a# 4))

(setq symbols '(-a -b -c b))

Symbols map on the tonality this way

-a an a are the same, they map on c 4

-b maps on the previous octave of the same tonality, which is a# 3

-c maps on g 3

b maps on the second note of the tonality, which is d# 4

Tonality which you define is actually FULL-RANGE

blues1 c 4 is a tonality repeating from zero octave and up

… c 3 d# 3 f 3 f# 3 g 3 a# 3 c 4 d# 4 f 4 f# 4 g 4 a# 4 c 5 d# 5 f 5 f# 5 g 5 a# 5 …

  -g  -f   -e  -d  -c   -b   a   b    c   d    e   f    g   h    i   j    k   l

Peter

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[ranga]

Thank you Peter. Now I understand.

Regards,

Rangarajan