Yes, the bounce occurs on the last quarter beat of the preceding bar or figure,with which we called or counted it 'a'. The 'a' count is the "up" count but does not produce the bounce.
The Samba Bounce Action can be applied to either foot, here let's assume the bounce starts with the left foot.
On the first half of the second beat of the preceding bar of music, one needs to compress the right knee. This is on the supporting foot and count two of the preceding figure.
Next is to straighten the right knee (supporting foot) as the right foot drives or pushes off
and the left foot moves into position (no weight).
Take full weight onto the left foot and allow the left knee to compress.
Now the left knee is almost straight as the right foot moves into position and takes partial weight.
Transfer the full weight, back onto the left foot, and allow the left knee to compress.
The last step is to straighten the right knee (supporting foot) as the right foot drives or pushes off and the left foot moves into position (no weight).
Either on the left or the right foot, the action enables the body to bounce up and down, while the weight is transferred side to side.
This movement should be differentiated from the hip movement, which incorporates the tandem actions and Cuban action, moves our hip forward, upwards, backward and circling up.
The bounce is used on all movements with the quarter beat, i.e. all figures with 'a' beat. For instance, if you are dancing SaS, also counted '1a2' (stepping left, right, left), support the majority of the weight, throughout the movement, on the left foot. This is the foot that provides the bounce.
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