The Pulsar Synthesizer is modeled after Curtis Roads' example in his book Microsound.* The synthesizer is an 8-channel implementation made in Max/Msp, and includes several of the features explained by Roads, among which are:
Pulsar train duration.
Pulsar train fundamental frequency envelope.
Pulsaret formant frequency envelope.
Pulsar train amplitude envelope.
Pulsar train spatial path.
The pulsar synthesizer is featured in my piece Sui Similis.
*Roads, C. (2004). Microsound. MIT press.