How to keep the EVO in vibrate mode?

[agolz12]

Since I've had the phone I have had a problem with the phone ringer accidently getting switched from vibrate to totally silent mode, I end up not realizing this and end up missing calls and texts. I have tried a bunch of different apps to keep the ringer from switching but none of them work, I tried tasker, volume locker, volume preventer, etc... I keep running into the same problem, the apps will stop the phone from increasing the ringer audio volume but they don't seem to differentiate between vibrate/silent mode, you are still able to toggle between silent and vibrate when the app is active. Has anyone else experienced this problem, and more importantly does anyone have a solution?