Sparkfun Midi Shield

Using Arduino Audio
1

Just got the Sparkfun Midi Shield...
Are the buttons and pots not connected to any pins?

2

The second paragraph of the link you posted says:

The MIDI Shield provides an opto-isolated MIDI-IN port as well as a MIDI-OUT port. The MIDI Shield can be mounted directly on top of an Arduino, connecting the MIDI-IN to the Arduino's hardware RX pin and the MIDI-OUT to TX. Potentiometers are connected to analog pins 1 and 2, and can be used to control volume, pitch, tone or anything else you'd like. Also connected on the shield are three momentary push buttons (connected to D2-4), a reset button, and green and red stat LEDs. The RUN/PROG switch allows you to program the Arduino over serial without having to remove the shield.

I assume English is not your native language, so to summarise:
The pots are on analog pins 1 and 2.
The three button are on digital pins 2, 3, and 4.