Hi Thorben,
Glad we got the one problem solved!
For MIDI cables: You can kind of think of them in a similar fashion to physical cables, but with the caveat that each cable has to have a defined directionality. By that, I mean that each cable (eg. Maple 1) should be set only as an "In" or an "Out" for any given MIDI device. I'll use "Maple 1" as the example MIDI cable below.
To use SynthFont with Composer as a MIDI Playback Device, using "Maple 1" as the virtual MIDI cable to connect them:
Since you've already installed SynthFont and Maple MIDI, as well as Notation Composer, all that is left is to configure them.
Be sure that SynthFont is running before opening Composer. This assures that the connections will all be made correctly. (Sometimes it works ok to open it after, but sometimes not.)
In Composer:
1. Click on Setup/MIDI Device Configuration.
2. Then Port/Select Ports.
3. In the Left hand "Input ports", uncheck the Maple 1.
4. Click "Ok" to exit and save.
This step above effectively sets the "directionality" of the Maple 1 virtual cable to go Out from Composer, and In to SynthFont.
Now, in SynthFont:
1. Edit/Options
2. IO Ports, and click to select Maple 1 in the upper-left hand "Select MIDI Input ports" box.
3. Click "Ok" to save the selection.
4. Now click the "Activate MIDI Input" button on the tool bar.
Now when you play a song file in Notation Composer, it will use the soundfont that you have open in SynthFont to play the song. Likewise, if you play your keyboard, routed through Notation Composer, it will also use the soundfont in SynthFont.
The cool thing about soundfonts is that there are a boatload of really nice ones available free on the internet. We have an information page at
http://www.notation.com/Articles-Soundfonts.htm that might be helpful in getting some really good instruments, as well as interesting pads and such, or even tutorials on how to create your own soundfonts
Hope this helps!
Sherry