PF_CHECKOUT_LAYER_AUDIO of another audiosource in composition

Hi,

I'm trying to get acccess to the layers audio of another layer in composition. So I defined an GUI-Element where I can choose the layer I want to get the audio from.

PF_ADD_LAYER(   STR(StrID_Popup_Layers),

                 PF_LayerDefault_NONE,

                 AUDIOLAYER_DISK_ID);

The next step is to get the audio of the choosen layer in Audio_Render(...){...}. And that's my problem. I do have access to the audiolayer the Effect is assigned to with the following lines:

ERR(PF_CHECKOUT_LAYER_AUDIO ( in_data,

                                 AE3DSOUND_INPUT, // Param index

                                 in_data->start_sampL, // start time

                                 in_data->dur_sampL, // duration

                                 in_data->time_scale,

                                 SND_RATE_44100,

                                 PF_SSS_4,

                                 PF_Channels_MONO,

                                 PF_SIGNED_FLOAT, // fmt

                                 &audio ));

I'm also able to process image adjustments of the choosen layer with this lines:

// Checkout

PF_ParamDef     checkout;

err = PF_CHECKOUT_PARAM(in_data,

                            AUDIOLAYER_DISK_ID,

                            in_data->current_time,

                            in_data->time_step,

                            in_data->time_scale,

                            &checkout);

Is there a way to get the audio of the choosen layer?

Best regards!

hutapp