Soft rhythms are cut chords and single notes played with the left hand to accompany melody notes played with the right hand. They are for electronic keyboards which do not have hammer-action keys to play on softly or loudly, keyboards which have only one volume control for all keys.
Soft playing is using some 1/8th and 1/4 notes in place of chords. The chords and notes are played with fingers 5, 2 and 1 of the left hand.
Here are some simple exercises to practise.
First play the beat or pulse in 4/4 time like this, with four quarter notes:
dg1
Then play the pulse in 3/4 then 2/4 time.
dg2 dg3 
Next play these soft rhythums with the left hand:
A block triad chord with silences;
dg4 
Chord then index finger, finger 2;
dg5 
Chord then 5th finger, 1st, and 5th again using the little finger and thumb and turning the wrist;
dg6 
Chord with single notes played with the pointer finger but with two 1/8th notes played on the third beat for the duration of one quarter note;
dg7 
Block chord then pointer finger, with two 1/8th notes, in 3/4 time:
dg8 
A 1/8th chord then thumb then little finger;
dg9 
Chord then pause then a 1/8 note to end the measure;
dg10 
Raise the wrist for the single notes played with the 2nd finger, and lower the wrist for fingers 5 and 1 played together.
dg11 
Play chords and notes louder or longer between phrases of a song and at the beginning and end of a song, and for an instrumental in the middle of a song.
dg12 
dg13 
Play one rhythum for one measure or bar then change to a different rhythumn for the second bar, then keep repeating the two rhythums together.
