Ah OK – I didn’t pick up that you wanted it to ramp from one value to the next. Try this:
period = 5; // every 5 seconds
seed = Math.floor(time/period);
seedRandom(seed,true);
xNow = gaussRandom(50,60);
seedRandom(seed+1,true);
xNext = gaussRandom(50,60);
x = linear(time,seed*period,(seed+1)*period,xNow,xNext);
y = x;
[x,y]
Dan