I say 'possible' because I'm not sure if this is intended behaviour or unintended.
ftm: http://www.mediafire.com/?b963ti9a8b6t7kw
Mute everything but namco 2 and namco 3. Notice that when both are on, the third echo is at full volume -AND- plays on the wrong channel, yet when only namco 2 or namco 3 is on no such anomaly happens.
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bite-sized songs inspired by rhythm game music, in Famitracker: http://soundcloud.com/patashu
Wave Position: The position, within the chip's 64 bytes of wave RAM, in which all waves in this instrument will be placed. Note: It is up to the user to ensure no two instruments attempt to read from the same memory position at the same time in the module.
Both your N163 instruments were in memory pos. 0, which causes conflicts. Also, your lead and echo use the same instrument, which has a wave envelope in it. This means every time a note plays in the echo channel, the wave envelopes plays in the lead channel as well. You need to watch out for that.
Another problem I'm having now is: I moved Namco 3 into Namco 2 (single channel echo) and whenever a note plays in Namco 2 it starts a new note in Namco 1, e.g. the slapbass plays triplets whenever Namco 2 echoes. Is there a fix for this as well?
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bite-sized songs inspired by rhythm game music, in Famitracker: http://soundcloud.com/patashu