I realise this is an old topic, and no one may be looking any longer - but here goes anyway.
I found "Latin Dancer's" analysis of the second-beat technique in international rhumba very helpful, especially the importance of using 25 bpm music with the fourth crotchet played or emphasised as two quavers(eighth-notes). The trouble is, in my collectioon of approximately 100 supposed rhumba tracks, hardly any have the fourth crotchet emphasised in this fashion.
Can anyone put me onto a source of rhumba tracks played by a band or bands which clearly and audibly play or emphasis the fourth beat as two eighth-notes in the manner described by "Latin Dancer"?
Thanks.