Third hand?

How many hands
does an organist have?
​
Many think that two
but Samuel Scheidt wrote
that both feet should be treated
as a third hand.

This makes sense
when you think that
in every chorale setting
or a hymn
the feet could play
any voice in the appropriate range,
be it the bass with 16',
the tenor with 8',
the alto with 4',
​or even the soprano with 2'.

---

Ausra's Harmony Exercise:
Modulation from C Major to A Minor: I-ii42-V65-I=III-iv-iv+65-i64-V-V7/6-i

---