Hi, There are no "static signals" - S&H is constantly updated with current voltage in the DAC output. NJU7304 was pretty good at droop rate of 1mV/5ms. Of course "low leakege" is needed, but I can´t see reason to use OTA (with hold cap and buffer OpAmp) as analog switches already have MegaOhm off state, so it´s more up to the cap and switching rate to hold the voltage. Moebius