mpearsontreev: Same issue as others: plugged in a headset and then poof, the speaker phone or microphone wont work. I used this handy app and it fixed the problem.

davidhclee: I have a Treo 650 which works only with the headphone plugged in, no sound output from the internal speaker at all. Tried the head phone jack fix, but couldn't solder the signal 1/signal 2 pads because they are so small. Decided to try HeadCold to divert the sound to the speaker - hey, presto! it works! My Treo 650 is svaed from the junk heap!!!

alanildmee: HeadCold +dBpoweramp + TCMP + 650 = no need for iPod. Great little prog saved me a bunch. Thanks

redcore: Might as well add "680" to the tested with column, because it worked for me. I'm not sure why, but when I used my phone with my headset...it wouldn't go back to the internal speaker/mic mode. I figured what the hell, might as well try this since I couldn't use my phone - and good thing it worked out. Thanks a lot!

conradknapp: yeah with a lot of other comments it did get the headphones to work but does not auto swith so i have to make sure i manually switch or i will never hear a call

xblu322: whoa...nice app.... made my treo a truly sound system!!! tnx.... but please make sure that the auto feature works.... but.... soooo great!!!

dbareis: Excellent (except it doesn't remember settings after soft restart. Needed as my car kit's speaker has high pitch squeal, so override to use inbuilt speaker.

garageink: it'd be a 10 if auto worked on my 600. otherwise works great.

atvh: Just FANTASTIC and Great! I can now listen to usic from my Treo 600 and not have to carry a mp3/WMA player around with me. My Treo is now an all rounded TOOL. One small comment is that the AUto function does not work on my Treo but I can live with that as I can chose when to or not to have sound from the speaker.

cerh: excellent, it solved a sound error on my treo 650.