>So my intention was to use a serial to parallel shift register
>to give me the required outs from a couple of pins. Trouble is
>that it seems only 8 bit SRs are common now (and the level
>meters / bargraph displays are all 10 part) so I was wondering
>how other people have done this.

Microchip have some 16 bit serial to parallel registers - MCP23016 port 
expander (there is also a MCP23x08 8 bit expander). The other thing you can 
do is cascade 2 8 bit chips to make a 16 bit output. 

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