[Alsa-user] Can not open /dev/sequencer

[Stefan T. <kon...@go...>]

Dear community,
I have the following problem:
I want to use the software rumor (which can be used do create midi-code via
midi-keyboard).
When I type

> rumor --oss
>
I get

Can not open /dev/sequencer

When I just type rumor
I get

> ALSA port connection error; do it manually using `aconnect'
>
and it doesn't react von midi-input.
What can I do now to get it working?