How to split autobeam

[Gerard L. Maters]

Dear all,

 

in a \time 4/4 a sequence of chords is written, patterns like this:

 

<<cis,8 eis gis cis>> <<cis,8 eis gis cis>> <<d,8 f a d>> <<d,8 f a d>>

 

these 4 chords are beamed together. But I need the two chords cis,8 beamed together and the two chords d,8.

Tried several options, like the \noBeam and the override auto-beam commands.

But I cannot get it working properly.

 

Please help in finding the correct notation.

 

Thanks very much,

Gerard