Riccardo:
 
> > I can confirm that it works well with Csound versions up to 3.48
>

Tobias:

> Not for me.  Csound Version 3.473 (Mar  9 1998) has a linseg
> opcode that resembles more an IIR filter than a line generator.

Csound v3.43 produces a single cycle spike.

-David.