Soundgin (sound/speech synthesis on a chip)

Soundgin (http://oopic.com/soundgin/) is a serially controlled sound/speech synthesizer. I was looking into connecting one to an Arduino for sound generation on a project I'm making.

I have a schematic for connecting it to a PIC, which I believe would be analogous to connecting it to the appropriate Arduino pins that I designate using software SoftwareSerial(rxPin, txPin).

There are 4 connections to the PIC: serial in (which I would connect to RX), serial out (TX), ground (duh), and input. The input PIC pin is connected to the CTS pin of the Soundgin chip.

Aside from the fact that I might have TX and RX backwards in the above example, my problem is that I don't know what should be connected to CTS, if anything. I'm not finding any specific on this within the serial tutorials on the Arduino site. I did find another forum post on integrating bluetooth that suggested I should just connect RTS and CTS to one another, or else nothing at all. (here: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1143603876/11) This is probably specific to this bluetooth modem though.

Would I need to connect CTS to anything on the Arduino? FYI I'm using the 0007 version of board.

The PIC schematic is on p. 40 here: http://si.fileburst.com/SoundginDatasheet.pdf

Thanks for any and all help!

[edit: alternately, let me know if there are any other serial communication methods that would be better. There are several serial tutorials on the Arduino main page that I believe reference older versions of Arduino that I'm somewhat confused by]

do you find anything? you solved it?

any info on this would be greatly greatly appreciated

If you aren't determined to use the SoundGin, you might be interested in.....

http://www.arunet.co.uk/tkboyd/ec/ec1speak.htm

Which explains using the similar "SpeakJet".

Even if you are, there will be things in that which may be useful to you.