public void TestHold()
        {
            var handler = CommandGenerator.CreateAutoCommandHandler <FairlightMixerSourceExpanderSetCommand, FairlightMixerSourceExpanderGetCommand>("Hold");

            AtemMockServerWrapper.Each(_output, _pool, handler, DeviceTestCases.FairlightMain, helper =>
            {
                TestFairlightInputSource.EachRandomSource(helper, (stateBefore, srcState, inputId, src, i) =>
                {
                    IBMDSwitcherFairlightAudioExpander expander = GetExpander(src);

                    var target = Randomiser.Range(0, 4000);
                    srcState.Dynamics.Expander.Hold = target;
                    helper.SendAndWaitForChange(stateBefore, () => { expander.SetHold(target); });
                });
            });
        }