Here is the only tonal writing system I have made. It has ten tonal marks, but only eight tones, two of the marks not being true tones.
One of them means that you delete the tone that would normally be there, and another mark indicates that the previous consonant is ejective.
Here is a link that talks about ejective consonants: the descriptions may not help you much, but at the bottom their is a sample list so that you can listen to some of them.
http://en.wikipedia.org/wiki/Ejective_consonantHere is the script.
Attachment:
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By the way, I called ejective consonants glottalized consonants in the attachment. I am pretty sure they mean the same thing.
Aleph, the Hebrew letter I mentioned in the attachment, represents a glottal stop. Here is a link about the glottal stop. There is a button on the right with an arrow on it that will play someone saying the sound (very useful). It is the sound we always make before a vowel when there is no consonant before it.
http://en.wikipedia.org/wiki/Glottal_stopHere is a link that talks about tones.
http://en.wikipedia.org/wiki/Tone_%28linguistics%29Hurrah for unfamiliarity!