I've been practicing seventh chords on piano using a number of patterns.
I'm playing all four inversions for major, minor, half-diminished, and dominant sevenths.
One pattern I use is to play full four note voicings in each hand and ascend or descend the octave. My target speed is around eighth notes at 60 bpm.
I do a variation on this where I play each chord in three octaves before ascending/descending to the next root. That pattern is at a much slower rhythm. I also try shakes between two finders while holding the other two fingers down. Another is arpeggiating the chord along the lines of Girl With the Flaxen Hair at m. 24.
I think this is helping me get to the point where I can instantly hit just about any common chord in any voicing anywhere on the keyboard.
Any recommendations for or against these kinds of drills? Are there particular aspects to focus on?