74LS90 replacement

[Plinio Andres Barraza]

I really shouldn't be talking because I don't know my stuff real well but
I was thinking about these step generators and I thought:

Instead of using these chips that generate a given amount of steps, 
Why not make an LFO with sweveral waveform out (like noise, saw, triangle,
[sine, square,] and their inverses) and instead of adding step out, add a
couple sample and hold circuits that you could set up so that you can get
any number of steps up from a sawtooth (up or down), or ascending
decending steps from tri or sine, or random from noise. 

Is this possible or would it make the circuit too complex?

Plinio