You need to use the "Change Meter" command. Choose MIDI>Change meter or Click the Change Meter button in the far left of the Meter Ruler or Move the cursor into the meter ruler where you want the Meter Change Event to happen, and then Control-click to insert the event. You could also just double-click on the time signature icon in the transport. Any of these methods will open a Temp/Meter Change dialog window (this is also where you can insert Tempo change events). You simply enter the location of the change and select what the new meter will be (3/4, in your case). You can check the "snap to bar" option if you want the meter change event to line up with the first beat of the nearest measure. You also, obviously, need to select a note value for the new meter /click (quarter-note, eighth-note, etc.). Hit apply and your done....you will now see a meter change event marker in the Meter Ruler. good luck - PS - You are not actually manupulating the click/tempo/meter with QT...the click is simply midi data that you output to any available MIDI device. Unless you have an external MIDI sound module, you sent it to the Mac OS's native MIDI software device, which is QT (using channel-10 for drum sounds, right?). Quicktime is simple just playing back the MDI data. In addition to selecting a midi device, you'll notice in the "Click Options" dialog window that you can also select which exact midi notes to choose for your click, as well as velocity information (which allows you to control the accents).