Analog Waveforms is a free plugin featuring the
basic waveforms of an analog synthesizer. Each
waveform has been sampled note by note across 7
octaves (each sample being 10 seconds in length)
which gives an accurate and genuine sonic
representation of an analog synthesizer. The
synthesizer in question is the Mopho by DSi.
All the samples have been looped for sustain notes
and they are made available to the public domain.
They can be downloaded separately from the plugin.
Note that the plugin itself is not public domain.