update template config with new keys

    fmt: "HOA3"

    ### Input sampling rate in Hz needed for headerless audio files; default = 48000

    # fs: 32000

    ### Enable check for input files being aligned to a integer multiple of a given length in ms.

    ### If a file is not aligned, a warning will be issued. If the input format has metadata or force is true, an error is raised instead.

    # aligned_to:

    ### alignment length in ms, is needed if aligned_to is used

    #     len: 20

    ### default: false

    #     force: true

################################################

### Pre-processing on individual items

    # preamble: 10000

    ### Flag wheter to use noise (amplitude +-4) for the preamble or silence; default = false (silence)

    # preamble_noise: true

    ### Specify postamble duration in ms. Postamble is added after concatenation and possible signal repetition. defaut = 0

    # postamble: 20

    ### Flag wheter to use noise (amplitude +-4) for the postamble or silence; default = false (silence)

    # postamble_noise: true

    ### Additive background noise

    # background_noise:

        ### SNR for background noise in dB; REQUIRED for prerecorded background noise and ignored for low level noise