Comment 7 for bug 918470

Yup, that was what my comment was about. These changes also need to be made:

=== modified file 'mixxx/src/engine/enginefilterblock.cpp'
--- mixxx/src/engine/enginefilterblock.cpp 2012-05-01 05:59:37 +0000
+++ mixxx/src/engine/enginefilterblock.cpp 2012-05-01 14:15:50 +0000
@@ -71,15 +71,15 @@

     filterpotLow = new ControlLogpotmeter(ConfigKey(group, "filterLow"), 4.);
     filterKillLow = new ControlPushButton(ConfigKey(group, "filterLowKill"));
- filterKillLow->setButtonMode(ControlPushButton::TOGGLE);
+ filterKillLow->setButtonMode(ControlPushButton::POWERWINDOW);

     filterpotMid = new ControlLogpotmeter(ConfigKey(group, "filterMid"), 4.);
     filterKillMid = new ControlPushButton(ConfigKey(group, "filterMidKill"));
- filterKillMid->setButtonMode(ControlPushButton::TOGGLE);
+ filterKillMid->setButtonMode(ControlPushButton::POWERWINDOW);

     filterpotHigh = new ControlLogpotmeter(ConfigKey(group, "filterHigh"), 4.);
     filterKillHigh = new ControlPushButton(ConfigKey(group, "filterHighKill"));
- filterKillHigh->setButtonMode(ControlPushButton::TOGGLE);
+ filterKillHigh->setButtonMode(ControlPushButton::POWERWINDOW);