gistfile1.mm

 renderer.block = ^(const AERenderContext * _Nonnull context) {
        AEBufferStack *bufferStack = context->stack;
        
        const AudioBufferList * bufferList = AEBufferStackPushWithChannels(bufferStack, 1, 2);

        if ( !bufferList ) {
            return;
        }
       
       
        float *leftBuffer  = (float*)bufferList->mBuffers[0].mData,
              *rightBuffer = (float*)bufferList->mBuffers[1].mData;
        
        UInt32 byteSize = bufferList->mBuffers[0].mDataByteSize;
        
        if (isLoading || isPaused) {
            memset(leftBuffer,  0, byteSize);
            memset(rightBuffer, 0, byteSize);
        }
        else {
            
            // This part fills the left and right channel buffers to be sent to TAAE2
            int32_t *currentStep = [self.modPlayer fillLeftBuffer:leftBuffer
                                                  withRightBuffer:rightBuffer
                                                    withNumFrames:context->frames];
                
            
            int currentPattern = currentStep[1],
                currentRow     = currentStep[2];

            if (lastPattern != currentPattern || lastRow != currentRow) {
                __weak typeof (self) weakSelf = self;

                int32_t playerState[4];

                [weakSelf notifyInterface:playerState];
            }

        }

        // apply the EQ to left
        for (int i = 0; i < 10; i++) {
            AEModuleProcess(PEQ[i], context);
        }
        
        AERenderContextOutput(context, 1);

    };