There’s no MIDI-In at my laptop’s soundcard. Is it possible to connect a MIDI-Keyboard via USB/Firewire? Which hardware (external soundcard or something else) could/shoul solve this problem?
If there is a way: does anyone work with it? What about the latency? I want to insert notes while playing (realtime). Is it possible?
Most (all?) MIDI controllers today have a USB port. Latency is not a problem at all. If you have a keyboard with only MIDI and no USB you need a MIDI interface. Something simple like this for instance: