<p dir="ltr">There are Arduino shields that can do the basic voltage summing to do multiple voices, but on it's own, lacking a true DAC, it can't. The RPi just has standard audio output available, so it's pretty simple to do whatever you want in software.</p>
<div class="gmail_quote">On Aug 9, 2013 9:29 PM, "Hugh S. Myers" <<a href="mailto:hsmyers@gmail.com">hsmyers@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Probably easiest. For a real challenge, implement an appropriate subset of lily (Google it: lily music language)<div><br></div><div>--hsm</div><div>p.s. seems to me there are arduino/pi addons with more than single voicing no?</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Aug 9, 2013 at 5:25 PM, Neil Van Dyke <span dir="ltr"><<a href="mailto:neil@neilvandyke.org" target="_blank">neil@neilvandyke.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Anyone currently working with music mini-languages in Racket?<br>
<br>
Reason I ask... In my iRobot Roomba Racket interface, I currently have a simple music mini-language that lets you specify a sequence of pairs of note/frequency and duration. (Roombas have a simple single-voice note-playing capability.) To make encoding of, say, piano sheet music easier in the mini-language, I'd like to adopt more of the conventional music notation conveniences, such as time signatures. I've found "<a href="https://ccrma.stanford.edu/software/cmn/" target="_blank">https://ccrma.stanford.edu/<u></u>software/cmn/</a>' for Common Lisp, so I'm wondering whether I should implement a subset of that, or something else that Racket people are already using.<br>
<br>
Neil V.<br>
<br>
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