I’ll try answer all of your different posts on this thread!
Just to clarify, Dubler has no internal sequencing, the in-built sounds are purely for audio feedback and can not be recorded. Dubler is intended for use as a MIDI controller with external DAWs, so think of it in just the same way as a MIDI keyboard for example. You can record anything you like in your DAW, using Dubler as an input.
We have some in-built sounds so you can adjust settings, or get to grips with Dubler, without always having to connect to an instrument in your DAW.
With that in mind, when it comes to chords you can specify the duration of each chord by simply singing for that length. Or if you wanted to use MIDI effects, you could separate the MIDI channel the chords are sent out to and use a MIDI effect unit to dictate the length so you can sing single note melodies over the top
I hope this is explained properly, if you have any questions let me know