I heard you more than once. I didn't think to use a PL tone.
I just had a nice 60 degree pass over CM98, and using the tracking info from http://amsat.org.ar/pass.htm# I was able to throw my call sign through the satellite, but only once. There is about a half-second delay on the Receive side, but it's not at all a problem.
The success was just a bit after TCA. I did have the 67 hz tone enabled throughout the pass, manual tuning of Tx and Rx, per the info from the website (thanks Pedro!). Very clear audio on the downlink, nice and strong. But I couldn't do it again. Just the one transmit / receive event. No other traffic heard, though there might have been some weak stuff earlier in the pass while I was tuning around.
Next pass is very low to the north west, but may give it a try.