Another met trick - works great with a harmony director, dr beat, or another met with sliders for various beats. Turn on the met with 8th notes. Start foot taps on the downbeat. Slowly pull down the slider for the downbeat, so you're only hearing the upbeat click. Work on keeping the foot taps in time. Do the opposite with playing on the upbeats. Start the met with 8th note clicks, get the upbeats in time, slowly pull down the slider on the upbeat click until they only have the downbeats to listen to. Slowly pull that slider down so they have to do it internally. Then add tubas back in.