void CMainFrame::OnDuplicatePatterns()
{
    // should add undo here? insert/duplicate frame don't

    CFamiTrackerDoc *pDoc = (CFamiTrackerDoc*)GetActiveDocument();
    CFamiTrackerView *pView = (CFamiTrackerView*)GetActiveView();

    unsigned int Frame = pView->GetSelectedFrame();
    unsigned int FrameCount = pDoc->GetFrameCount();
    unsigned int Channels = pDoc->GetAvailableChannels();

    if (FrameCount == MAX_FRAMES)
        return;

    // insert new frame with next free pattern numbers
    pView->OnModuleFrameInsert();


    // copy old patterns into new
    for (unsigned i = 0; i < Channels; ++i) {
        for(unsigned int j = 0; j < MAX_PATTERN_LENGTH; j++) {
            stChanNote note;
            pDoc->GetNoteData(Frame, i, j, ¬e);
            pDoc->SetNoteData(Frame + 1, i, j, ¬e);
        }
    }
}