As you know in notated scores you often define how the (8th or quarter note etc.) timing gets interpreted in the new time signature, whereas we have it so 8th = 8th. This means 2/4 followed by 3/8 works and 6/8 followed by 3/8 works. It can get complicated. Sometimes you can do strange things with x/8 and/or x/4 time signatures as 'sub-measures' to get somewhere near a rhythmic feel for a backing track, but it might not be easy to read if you are looking at the chart and because of the randomness of the player, might not always be the feel you want as it plays through.