Thank you all for your comments. Actually I record my own tracks one by one with just one high quality tube condenser microphone at my home in a small room neither sound insulated nor any acoustic treatment. But it's so quiet here in the suburb of Helsinki and sensitive mic, that no problems with background noise.
Nice, if it sounds like a live band playing around one mic and solists stepping forward for their part, like it used to be. I also use a small delay for the backing instruments, so in the sound picture they feel to be in the back stage. The sound of the solist not delayed comes first to listener, so they feel in the sound picture to be in the front of the stage as they should. It's nice to hear, it works and gives the feeling of a live band playing at the stage.
I admit again, that my weakness is the vocals: I know how I should sing and use a pilot melody track (usually vibes or piano), but still I can't produce the vocals I wanted and can't be in pitch. The ReatTune, which comes with Reaper, helps a bit, but makes vocals sound messy.
I'm looking for featuring singers to record their vocal track listening to my background I send to them and then I mix it to my master. I have tried this a couple of times and it works. Here is an example: Lee Amari from California featuring in my song Country Songs' Seacret: https://soundcloud.com/esa-blomberg/country-songs-seacret-arri-feat-la-jl?si=7b9cc3dedbe148f39b413be177183579&utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing
Volunteers?