OpenSebJ version 0.06 has been released, this means that an official beta is getting close and will be released soon. Only a few features are outstanding before OpenSebJ will take off the Alpha shackles and make a Beta.
In this release a new feature has been included which you (probably?) won't find any where else - a position record straight to the multi track sequencer has been included. All you need to do is assign the samples to a key - open the lay down window hit the Key Record button, play and then tap out your beat.
I haven't kept up with the commercial software but I think this feature has a chance to rival the their products positions.