Perhaps a description of the real problem is in order. Is it simply a case of not having the correct tempo set?
You're right, I didn't explain it well.
This is for a church service long enough I can't learn it all. (27 pieces in one service, 3 services to prepare) I want to combine what I will actually play with what I will have to pre-record. I did an entire year of church service music by writing it out in NWC, using playback to record it as wave, and burning a CD. During that time I was practicing piano, and at the end of the year mostly transitioned to playing it live.
Some things lend themselves well to a fixed tempo. For example, hymns. With a little experience it is not hard to pick singable tempos.
Other pieces do not work at all. For example, chants and other responsorials. For these, you will hold a chord for a number of syllables then change. The number of syllables differs on every verse in an unpredictable way, and there are many verses. Singers and the congregation are pretty much unpredictable for this kind of stuff.
I had a keyboard once that would do what I want. It had a manual play feature. I could record into its memory and either play it back in tempo, or play it back one note at a time by pushing a button.
There are people who use virtual orchestras for opera, even for some productions, and they have this kind of manual stepwise playback feature in their software.
I have done a lot of googling looking for this feature and can't find it. I think it is because I don't know the correct name.
I know that I can enter notes either in real time or stepwise. I have a MIDI interface between my digital piano and my laptop, and NWC works fine accepting and playing back notes.
However, I need to do stepwise playback. (I don't know the real name of this function.) I need to enter a series of notes or chords, and have it play them back one at a time when I hit enter, space bar, mouseclick, etc.
That way I can do playback accompanying a singer and stay right with her.