Hi!
Im making some chiptunes and and want to make a 8-bit Tuba-sound!
Does someone have an idea about how i should make that from scratch?
Bitcrushing a tuba-sample is out of the question!
I have some plugins, i tried Basic 64 with some sawtooths, envelopes and distortion but it doesn’t sound too much like a tuba…
Thank you!
A saw sounds a bit like a tuba 
Maybe layer it with a triangle?
Have a look here for some basic help on synthesizing real instruments and if you’re feeling adventurous have a look at this SoundOnSound guide (indeed, have a look at the whole series of articles)
I’ve had a go at making a tuba using Basic64; ok, it’s not that convincing but it’s as close as I could get (and i am in bed sick! 
). Problem is that the filter is not ‘strong’ enough and there is no envelope for the filter so I crudely automated a filter in renoise (the xrns file can be found here and an mp3 as well
from the SoundOnSound article:
You might ask why I don’t use all three of the oscillators that the Minimoog provides. Surely this would create a richer sound, and provide more flexibility regarding the precise timbre? There are two reasons for not doing this; one acoustic, and the other practical. The acoustic reason is simple. The interaction of two or more oscillators — which inevitably on an analogue instrumke the Minimoog will detune and drift with respect to one another — is quite unrepresentative of the original instrument…
I dunno about the drift of the oscillators on Basic64(!) but certainly a single oscillator is required here (imho)
Hope that helps
Cheers!
[btw]if you want tuba samples then click here (64Mb)[/btw]
On this page there is a picture of a soundwave of a tuba. Maybe you can draw an instrument by hand that looks like it in Renoise?
Don’t know if it helps or not… 
Just an idea.
Cool, I’m gonna give that a go (but is it strictly ‘chip’ tune? 
)
fascinating site btw…and I thought I was a geek for answering this topic! Good to see good ol’ CoolEdit in the screenshots
[EDIT]this is somewhat easier to use the custom sample generator first to create a saw and go from there…interesting results although somewhat bereft of brass soundage![/EDIT]
Are you calling me a geek??! 
Idk… it was just an idea I got while thinking about the mainproblem. Hopefully, he/she has got his Ompa-ompa-omp sound under control by now.