Have managed now to install cap1xxx - when I realised that it was the digit 1 rather than the letter l in the middle...
Unfortunately running drumhat.py results in the same error as before:
pi@raspberrypi ~/drum-hat/examples $ sudo python3 drumhat.py
['drums2/000_base.wav', 'drums2/001_cowbell.wav', 'drums2/002_clash.wav', 'drums2/003_whistle.wav', 'drums2/004_rim.wav', 'drums2/005_hat.wav', 'drums2/006_snare.wav', 'drums2/007_clap.wav']
Traceback (most recent call last):
File "drumhat.py", line 28, in
alert_pin=25)
File "/usr/local/lib/python3.2/dist-packages/cap1xxx.py", line 239, in init
self.i2c = SMBus(i2c_bus)
IOError: [Errno 2] No such file or directory
Exception AttributeError: "'Cap1188' object has no attribute 'alert_pin'" in del of > ignored