- Identified Flying Object: with Attila Gyárfás (drums) and Ralph Alessi (trumpet)
- Kimono Garden: electronica
- Alex Koo Trio: piano trio with Dré Pallemaerts (drums) and Lennart Heyndels (double bass), frequently joined by Jean-Paul Estiévenart (trumpet)
- Alex Koo/Mark Turner/Ralph Alessi : acoustic chamber trio ‘Appleblueseagreen’ with Mark Turner (saxophone) and Ralph Alessi (trumpet)