Kontakt is my go to soft synth for sounds. Here is what I have that will most likely work for you:

Upright/double bass - Kirk Hunter's Diamond Orchestra. There are key switches for pizzicato and adjustments for legato. With a high legato setting you can get a bowed sound. Wait for a sale if you don't want to pay full price.

https://www.kirkhunterstudios.com/shop/

I play bass so fretless bass is "organic"!

Again the Diamond Orchestra for the harp. It has the arpeggios but you can add a tremolo effect with some free VSTs and/or use Kontakt's Rotator. I use the latter.

Orange Tree Samples Pure Jazz Vibes are great:

https://www.orangetreesamples.com/products/pure-jazz-vibes

Sampleism' PSI Marimba is also great:

http://www.sampleism.com/paperstoneinstruments/psi-marimba?sk=kt

These are my choices. I hope this information helps.

Good luck.

{edit} I forgot the FXs. I search the Internet for a given FX as there are always free ones out there. I do not buy FX samples.

Last edited by MarioD; 07/26/16 11:49 AM.

I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware