Flipping out in Toon Boom

Because I work primarily in 3D animation the time for exploring digitally drawn traditional animation has been on and off. I am getting familiarizes with the Toon Boom interface and tools but one big obstacle I'm hoping someone has overcome is how to 'flip' or 'roll' the drawings as one would using paper.

I thought being freed from the mountainous stack of loose drawings would be a big advantage. And it is to some extent but there are times when I want just a few drawings and to be able to put them in any order I want.

Many is the time I will reverse the order of the Key drawings when I'm doing the inbetweens, rolling the drawings back and forth to see the action. I can't do that digitally. Now you can use what is called 'onion skinning' to look through your stack of drawings and you can scroll back and forth in a time-line to see the progression of the action but it's not as discrete as having those pages on pegs to roll between your fingers.

With paper I can find those tweaks a drawing needs as I'm rolling the pages back and forth and can make changes and additions on the fly. But digitally I need to be on the right image layer and have it active to access a drawing. I've drawn on the wrong image sometimes impulsively because I wanted to make that addition and forgot I had to break my concentration in order to pick the right drawing level.

There must be something I am unaware of because many big studios are using Toon Boom today and I'm sure these issues have been addressed by them.

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My friend Eric told me the keys F and G toggle between drawings and that seems to work to an extent. I can do better just scrubbing through the time-line.