This may help some people understand how the signal goes through the Tonewood Amp. I know it helped me. I asked and it has been confirmed as accurate. I didn't have the min and max for the DI blend but will add them later.

        Master         FX                100% Wet FX

        _Gain_        _Gain_    Effect      Volume

Input  |      |      |      |  |      |    |      | Output to guitar’s back

 X---->|5-100%|--X-->| 0-25 |--|      |--->| 0-25 |------------------------->

       |______|  |   |______|  |______|    |______|      

                 |                            |

                 |                            |                            

                 |                            |  100% Wet    D.I.

                 |                            |  FX Signal  _Blend

                 |                            |----------->|      |

                 |                   Dry signal from input |      |-->D.I. Output
                 X---------------------------------------->|______|

 Here is an updated version of the flow chart. This, as far as I know, is accurate.

        Master         FX                 100% Wet FX

         Gain          Gain      Effect     Volume

Input  |      |      |      |   |      |   |      |    Output to guitar’s back

 X---->|5-100%|--X-->| 0-25 |-->|      |-->| 0-25 |--X----------------------->

       |______|  |   |______|   |______|   |______|  |     

                 |                                   |

                 |                                   |                            

                 |                                   |  100% Wet      DI         DI

                 |                                   |  FX Signal   Blend       Volume

                 |                                   X------------>|      |    |      |

                 |    Dry signal from Master Gain                  | 0-25 |--->| 0-25 |-->DI Output         
                 X------------------------------------------------>|______|    |______|