i use a metronome, and the chromatic scale to build my speed. i generally use alternate fingers, and i play the scale in reverse alot too because it's harder for me to descend with my fingers for some reason

|-----------------------------------------------8-6-7-5-----------------|
|---------------------------------------9-7-8-6-------------------------|
|-------------------------------9-7-8-6---------------------------------|
|----------------------10-8-9-7-----------------------------------------|
|------------11-9-10-8--------------------------------------------------|
|-12-10-11-9------------------------------------------------------------|

|-5-7-6-8---------------------------------------------------------------|
|---------6-8-7-9-------------------------------------------------------|
|-----------------6-8-7-9-----------------------------------------------|
|-------------------------7-9-8-10--------------------------------------|
|----------------------------------8-10-9-11----------------------------|
|--------------------------------------------9-11-10-12-----------------|
i gradually turn the meronome up as i play when i can comfortably play at a certain pace.

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