parameters sequencer_name and sequencer_stream

I believe sequencer_name is meant to be typed 'alsa_sequencer_name'  (See where it is used in _init_handle)

sequencer_stream seems to be misnamed (it should be 'alsa_sequencer_stream'). The value of this parameter seems to be a MODE (BLOCK/NONBLOCK) rather than a STREAM (DUPLEX, INPUT, OUTPUT)

Please read the commit logs for more