Available in LEADTOOLS Medical Imaging toolkits.
DICOM Waveform Groups: Manipulating Channels
LDicomWaveformGroup::AddChannel
LDicomWaveformGroup::DeleteChannel
LDicomWaveformGroup::GetChannel
LDicomWaveformGroup::GetNumberOfChannels
LDicomWaveformGroup::GetNumberOfSamplesPerChannel
LDicomWaveformGroup::SetNumberOfSamplesPerChannel