Jiddu,
A portamento allows you to have an even slide to the next note. It makes the change smooth.... I really don't know if the N364 has this function.. I can see how you're upset if it doesn't too... That portamento comes in handy when doing solos and is a killer function when doing bass lines for dance music...
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.