Doepfer

Hi Greg


> I'm not sure I fully understand track & hold, so I thought I'd ask...
> 
> I am thinking of using the t&h module with a clock divider and a
> roland sh-2.  First, record in a series of voltages from the sh-2
> keys, then have the track&hold play them back.  With the clock divider
> triggering it every 4 beats or so, it would act like a recordable one
> bass note per measure sequencer of sorts.
> 
> Would that work? Or is there a better way to record(track/sample)
> simple sequences of voltages?
If I understand you correctly: Yes and No.

Basically you are asking some module, which holds certain voltage 
values. Both (S&H and T&H) do this.
The difference between "Sample and Hold" and "Track and Hold" is, how 
the behave on changes of the ingoing control signal.

S&H:
After powering the module/system up, a Sample&Hold "listens" to the 
input voltage. The output is 0V. As soon as the control signal changes 
from low(=0V) to high(=5V) the input voltage will be stored in the 
S&H-stage and offered at the output. It does not matter, whether the 
controlsignal is still up or down, and doesn't matter alos whether the 
input signal is changing or not.

T&H:
After powering the module/system up, also a Track&Hold "listens" to the 
input voltage. The output is 0V. As soon as the control signal changes 
from low(=0V) to high(=5V) the input voltage will fed through to the 
output. The output now will change with the input as long as the control 
signal is high. This is the "Track"-mode: the output tracks the input. 
As soon as the control signal changes back from high to low, the output 
signal (which was changing before) will be freezed at the momentary voltage.

If you compare it to the world of pictures, the S&H is like a photo 
camera, which picks that actual moment. The T&H is similar like a video 
which is sometimes playing sometimes paused.

So: for youre "sequencer" request: yes, multistage S&H and(!) T&H can 
behave like a sequencer, but in recording mode the S&H will behave more 
like expected than the T&H.

Florian